Our Team

OrthoPets is what you would consider to be a “well-oiled machine.” Our team is made up of a small group of people with a large variety of background experience.

Our modification team is comprised of a group of individuals with special interest and experience ranging from 3-D modeling, CAD and the human world of braces and prosthetics. Our assembly team is comprised of individuals from the veterinary field, experienced contractors and even experts in exotic species.

The Case Managers assisting you and your veterinarian through the process is comprised of Certified Veterinary Technicians with at least 8 years of clinical experience ranging from general practice, emergency and critical care, rehabilitation and internal medicine.

Our entire team is trained in Veterinary Orthotics & Prosthetics (V-OP) by our owner and founder, Martin Kaufmann as well as our Surgical & Sports Medicine Consultant, Dr. Felix Duerr.

We have pulled together the strengths of all of our employees with intensive training in order to provide our referring veterinarians and clients the best possible V-OP experience.

We feel that when you are searching for the right V-OP provider for your pet, it is important that you feel comfortable and connected with us. We understand this is not just a dog brace or prosthetic for you and your family. This is a second chance for your pet, maybe even a third or fourth. With that, we want you to know more about us!

  • Martin Kaufmann BS, ABC C-PED
    Martin Kaufmann BS, ABC C-PED
    Owner/Founder
  • Amy Kaufmann MA
    Amy Kaufmann MA
    Owner/Founder
  • Valerie Ortiz
    Valerie Ortiz
    OrthoPets United Office Manager
  • LiLen Lorenzi AAS
    LiLen Lorenzi AAS
    Certified Veterinary Technician OrthoPets Case Manager
  • Rachel Shireman
    Rachel Shireman
    OrthoPets United Case Manager
  • Ashley Kitzis
    Ashley Kitzis
    OrthoPets United Case Manager
  • Yvonne Phan
    Yvonne Phan
    Communications Coordinator
  • Janet Pink
    Janet Pink
    OrthoPets United Case Manager
  • Dr. Felix Duerr
    Dr. Felix Duerr
    OrthoPets Orthopedic and Sports Medicine Consultant
  • Jorden Hobbs BA
    Jorden Hobbs BA
    Communications Coordinator OrthoPets United
  • Rachel Dickinson BS
    Rachel Dickinson BS
    OrthoPets Fabrication Team
  • Josh Luebbers
    Josh Luebbers
    OrthoPets Fabrication Team
  • Robert Loa
    Robert Loa
    OrthoPets Fabrication Team
  • Michael Hall
    Michael Hall
    OrthoPets Fabrication Team
  • Jennifer Purcell
    Jennifer Purcell
    OrthoPets Fabrication Team
  • Vanessa Sandoval
    Vanessa Sandoval
    OrthoPets Fabrication Team
Martin Kaufmann BS, ABC C-PED
Owner/Founder

Martin Kaufmann BS

American Board of Certification, Orthotics, Prosthetics, Pedorthics
Martin began his career as an Orthotic & Prosthetic Technologist after graduating from Century College. He furthered his education in the field or orthotics and prosthetics and pedorthoics at Temple University. He enjoyed a rewarding 12-year career working with several companies including Tamarack Habilitations Technologies Inc, The Shriners Hospital (Intermountain Unit) and Winley’s Orthopedics designing, fabricating, fitting and modifying custom orthotic and prosthetic devices. During his career, he graduated from Temple University Podiatric Department with a Pedorthotic Practitioner degree and the University of Phoenix with a Business Administration degree.

The combination of his clinical, technical and business education has lead Martin to manage and direct multiple orthotic and prosthetic departments and companies before turning his time and talent to founding OrthoPets.

Martin lectures at many major universities, consults with hundreds of veterinarians, has published works in the “North American Rehabilitation Guide” and continues to advance the new profession of veterinary orthotics and prosthetics.

Martin’s personal interests include advanced biomechanical research, spending time with his family, camping, golfing, hiking, sewing, music production, architecture, and 3D computer aided product design.

Amy Kaufmann MA
Owner/Founder

Amy Kaufmann MA

Amy has a Bachelor’s and Master’s degree in Education. Amy over sees all aspects of OrthoPets, and is the CEO and President of OrthoPets.

Amy enjoys spending time with her two kids, and one dog!

Valerie Ortiz
OrthoPets United Office Manager

Valerie Ortiz

Valerie is a proud Colorado native! Valerie has a love for animals and customer client care. OrthoPets was bound to be where she belonged! Valerie has 3 kids and 1 dog. Her family loves to volunteer and go on outdoor adventures together.

LiLen Lorenzi AAS
Certified Veterinary Technician OrthoPets Case Manager

LiLen Lorenzi AAS

LiLen was born in Oklahoma but moved to Colorado when she was five. She graduated from Bel-Rea Institute of Veterinary Technology in 2006 with an Associates of Applied Science degree and completed her veterinary technician certification. She as worked as a Certified Veterinary Technician since graduation.

LiLen enjoys spending time with her family, friends, and pets that include a terrier-mix named Dreia and an Angora Rabbit named Rockstar. She loves working with animals and enjoys helping them achieve an enriched lifestyle through the help of orthotic and prosthetic devices.

Rachel Shireman
OrthoPets United Case Manager

Rachel Shireman

Rachel grew up in Michigan. Seven years ago, Rachel moved out to Colorado to attend Bel-Rea Veterinary Technician School. Rachel, and her pup, Chewy, ended up loving Colorado so much, they stayed :). Rachel graduated from Bel-Rea as CVT, and started working in a surgery department where she fell in love with the challenges of surgery. She also worked in emergency surgery too.

Rachel truly enjoys everything Colorado has to offer including hiking, camping, fishing, skiing, and the 300 plus days of sunshine!!

Ashley Kitzis
OrthoPets United Case Manager

Ashley grew up in Minnesota and received her AAS in Veterinary Technology in 2008 and became a certified veterinary technician. She moved to Colorado in 2009 because of her love for the mountains and outdoors. Ashley worked in a general practice and pain management veterinary hospital for 7 years, then moved to specialty medicine in 2015 and worked in the surgery department. She has worked with an array of extensive surgeries from soft tissue to orthopedics, as well as managed the mobile surgery department.

Ashley enjoys spending her time with her new baby girl and her husband while exploring all that Colorado has to offer. Their favorite activities are skiing/snowboarding, hiking, and camping. Hopefully adding a furry companion to their family is in the future!

Yvonne Phan
Communications Coordinator

Yvonne Phan, Communications Coordinator

Yvonne is a proud Colorado Native! She graduated in 2011 from CU Boulder with a BFA in Film Production. While loved working with visual storytelling, she dreamed of working with a company that makes orthotics and prosthetics for animals. As fate would have it, she joined the OrthoPets team in 2018.

In her spare time, Yvonne enjoys going to the dog park with her two pups Ginger and Bella, canoeing/kayaking, camping, and restoring furniture.

Janet Pink
OrthoPets United Case Manager

Janet grew up in small town Iowa with the desire to work with animals. Life took a detour and she ended up in marketing. Never quite happy with the work, she started looking into other options. After being laid-off, Janet quickly worked towards becoming a veterinary technician with the intention helping animals improve their mobility and quality of life. After graduating from Community College of Denver and becoming a CVT, she worked in a small animal hospital, then in canine rehabilitation. In her free time, Janet most enjoys hiking in the Colorado mountains with her husband, Rick, and their golden retriever, Bueller.

Dr. Felix Duerr
OrthoPets Orthopedic and Sports Medicine Consultant

Dr. Felix Duerr

Dr. Duerr earned his veterinary degree in Germany. He completed his internships in Saskatoon, Canada followed by his surgical residency/master’s program at Colorado State University. Dr. Duerr is the only practicing small animal veterinarian in Colorado that is double boarded by both the American College of Veterinary Surgeons (ACVS) and the American College of Veterinary Sports Medicine and Rehabilitation (ACVSMR). He worked in private practice for four years prior to joining Colorado State University in 2011. Dr. Duerr’s research focus is clinical studies aimed at improving animal health and quality of life related to orthopedic problems. His clinical interests include sports medicine and rehabilitation, cranial cruciate ligament injury including the investigation of alternative treatment methods, injury prevention, minimally invasive surgery (arthroscopy) and arthritis. Current research projects include the development of novel gait analysis techniques, evaluation of new treatment options for arthritis (surgical and non-surgical), and investigation of techniques to enhance bone healing. Dr. Duerr joined the OrthoPets team as their Orthopedic and Sports Medicine Consultant in the fall of 2014.

Jorden Hobbs BA
Communications Coordinator OrthoPets United

Jorden Hobbs BA

Jorden is a Colorado native who came to OrthoPets after a long stint working in the world of independent bookstores. She spends most of her free time riding horses and training them for the sport of equestrian vaulting, which combines dance and gymnastics moves on the back of a moving horse. She also enjoys reading, photography, baking, and spending time with her cat Bertie.

Rachel Dickinson BS
OrthoPets Fabrication Team

Rachel Dickinson BS

Rachel is a 3rd generation Colorado native. She earned a degree in Criminal Justice and Criminology with the intent of being an animal cruelty investigator. After an internship, she found the cases to be too heartbreaking. In 2005, she moved on to work at Denver Dumb Friends League as an intern to become a veterinary technician. She then moved her journey to low-income veterinary clinics and enjoyed helping families with financial constraints with their beloved animals. In 2012, Rachel joined the OrthoPets team!

Josh Luebbers
OrthoPets Fabrication Team

Josh Luebbers

Josh is a native to Colorado. He worked in the human field of orthotics for several years and decided to bring his knowledge from the human field to the animal field by joining the OrthoPets team in 2009.

Josh’s personal interests include playing various styles of music on both the electric and upright bass. He also enjoys spending time with his family, cats, and long drives to the mountains.

Robert Loa
OrthoPets Fabrication Team

Robert – OrthoPets Fabrication Team

Robert is a Texas native. He was born and raised in Houston. A lover of animals, Robert grew up with a beloved Chihuahua. Circumstances offered him the opportunity to begin working in the veterinary field when he started working at his first veterinary clinic. After working in the veterinary field for 2 years Robert found himself in a veterinary rehab clinic assisting the physical therapist. After working in the animal field for 7 years in Texas, Robert and his family decided to make the move to Colorado.

Robert enjoys spending time with his wife, daughters, Rosy, the Puggle, and Lady, the miniature poodle! They enjoy going camping, fishing, hiking,, and biking. He also enjoys watching sports with the guys!

Michael Hall
OrthoPets Fabrication Team

Michael Hall

Mike was born and raised in Topeka, Kansas. He received his BFA from the Kansas City Art Institute where his focus was on different mediums of sculpture. After college, he moved to SW Colorado to enjoy mountain life. In 2013, he decided to use his artistic abilities and hand skills to work in the human field of orthotics and prosthetics. His love of animals, the outdoors and mountains helped bring him to OrthoPets.

Mike’s personal interests include spending time with family, friends and his dog, “Whiskey.” He enjoys being active outside and furthering his artistic skills.

Jennifer Purcell
OrthoPets Fabrication Team

Jennifer Purcell

Jennifer has an MFA in Sculpture from NY State College of Ceramics at Alfred University. As an educator, she gained experience in 3D modeling, for use in animation, game design, and 3D printing. She is a native Carolinian, having moved to Colorado recently getting the chance to apply her love of animals, and passion for craftsmanship, to animal orthotics and prosthetics.

She enjoys working on her own artwork and spending time exploring the outdoors with her pit bull mix, Henry, and her partner Abby.

Vanessa Sandoval
OrthoPets Fabrication Team

Venessa is a Colorado native!
Venessa loves all animals, but her favorite are cats! Venessa enjoy spending time with her family, traveling, and attending concerts.

Venessa loves being a positive influence to others, and living life to the fullest! Venessa is excited about being part of the OrthoPets team, and she finds it very rewarding.

  • Martin Kaufmann BS, ABC C-PED
    Martin Kaufmann BS, ABC C-PED
    Owner/Founder
  • Amy Kaufmann MA
    Amy Kaufmann MA
    Owner/Founder
  • Valerie Ortiz
    Valerie Ortiz
    OrthoPets United Office Manager
  • LiLen Lorenzi AAS
    LiLen Lorenzi AAS
    Certified Veterinary Technician OrthoPets Case Manager
  • Rachel Shireman
    Rachel Shireman
    OrthoPets United Case Manager
  • Ashley Kitzis
    Ashley Kitzis
    OrthoPets United Case Manager
  • Yvonne Phan
    Yvonne Phan
    Communications Coordinator
  • Janet Pink
    Janet Pink
    OrthoPets United Case Manager
  • Dr. Felix Duerr
    Dr. Felix Duerr
    OrthoPets Orthopedic and Sports Medicine Consultant
  • Jorden Hobbs BA
    Jorden Hobbs BA
    Communications Coordinator OrthoPets United
  • Rachel Dickinson BS
    Rachel Dickinson BS
    OrthoPets Fabrication Team
  • Josh Luebbers
    Josh Luebbers
    OrthoPets Fabrication Team
  • Robert Loa
    Robert Loa
    OrthoPets Fabrication Team
  • Michael Hall
    Michael Hall
    OrthoPets Fabrication Team
  • Jennifer Purcell
    Jennifer Purcell
    OrthoPets Fabrication Team
  • Vanessa Sandoval
    Vanessa Sandoval
    OrthoPets Fabrication Team
Martin Kaufmann BS, ABC C-PED
Owner/Founder

Martin Kaufmann BS

American Board of Certification, Orthotics, Prosthetics, Pedorthics
Martin began his career as an Orthotic & Prosthetic Technologist after graduating from Century College. He furthered his education in the field or orthotics and prosthetics and pedorthoics at Temple University. He enjoyed a rewarding 12-year career working with several companies including Tamarack Habilitations Technologies Inc, The Shriners Hospital (Intermountain Unit) and Winley’s Orthopedics designing, fabricating, fitting and modifying custom orthotic and prosthetic devices. During his career, he graduated from Temple University Podiatric Department with a Pedorthotic Practitioner degree and the University of Phoenix with a Business Administration degree.

The combination of his clinical, technical and business education has lead Martin to manage and direct multiple orthotic and prosthetic departments and companies before turning his time and talent to founding OrthoPets.

Martin lectures at many major universities, consults with hundreds of veterinarians, has published works in the “North American Rehabilitation Guide” and continues to advance the new profession of veterinary orthotics and prosthetics.

Martin’s personal interests include advanced biomechanical research, spending time with his family, camping, golfing, hiking, sewing, music production, architecture, and 3D computer aided product design.

Amy Kaufmann MA
Owner/Founder

Amy Kaufmann MA

Amy has a Bachelor’s and Master’s degree in Education. Amy over sees all aspects of OrthoPets, and is the CEO and President of OrthoPets.

Amy enjoys spending time with her two kids, and one dog!

Valerie Ortiz
OrthoPets United Office Manager

Valerie Ortiz

Valerie is a proud Colorado native! Valerie has a love for animals and customer client care. OrthoPets was bound to be where she belonged! Valerie has 3 kids and 1 dog. Her family loves to volunteer and go on outdoor adventures together.

LiLen Lorenzi AAS
Certified Veterinary Technician OrthoPets Case Manager

LiLen Lorenzi AAS

LiLen was born in Oklahoma but moved to Colorado when she was five. She graduated from Bel-Rea Institute of Veterinary Technology in 2006 with an Associates of Applied Science degree and completed her veterinary technician certification. She as worked as a Certified Veterinary Technician since graduation.

LiLen enjoys spending time with her family, friends, and pets that include a terrier-mix named Dreia and an Angora Rabbit named Rockstar. She loves working with animals and enjoys helping them achieve an enriched lifestyle through the help of orthotic and prosthetic devices.

Rachel Shireman
OrthoPets United Case Manager

Rachel Shireman

Rachel grew up in Michigan. Seven years ago, Rachel moved out to Colorado to attend Bel-Rea Veterinary Technician School. Rachel, and her pup, Chewy, ended up loving Colorado so much, they stayed :). Rachel graduated from Bel-Rea as CVT, and started working in a surgery department where she fell in love with the challenges of surgery. She also worked in emergency surgery too.

Rachel truly enjoys everything Colorado has to offer including hiking, camping, fishing, skiing, and the 300 plus days of sunshine!!

Ashley Kitzis
OrthoPets United Case Manager

Ashley grew up in Minnesota and received her AAS in Veterinary Technology in 2008 and became a certified veterinary technician. She moved to Colorado in 2009 because of her love for the mountains and outdoors. Ashley worked in a general practice and pain management veterinary hospital for 7 years, then moved to specialty medicine in 2015 and worked in the surgery department. She has worked with an array of extensive surgeries from soft tissue to orthopedics, as well as managed the mobile surgery department.

Ashley enjoys spending her time with her new baby girl and her husband while exploring all that Colorado has to offer. Their favorite activities are skiing/snowboarding, hiking, and camping. Hopefully adding a furry companion to their family is in the future!

Yvonne Phan
Communications Coordinator

Yvonne Phan, Communications Coordinator

Yvonne is a proud Colorado Native! She graduated in 2011 from CU Boulder with a BFA in Film Production. While loved working with visual storytelling, she dreamed of working with a company that makes orthotics and prosthetics for animals. As fate would have it, she joined the OrthoPets team in 2018.

In her spare time, Yvonne enjoys going to the dog park with her two pups Ginger and Bella, canoeing/kayaking, camping, and restoring furniture.

Janet Pink
OrthoPets United Case Manager

Janet grew up in small town Iowa with the desire to work with animals. Life took a detour and she ended up in marketing. Never quite happy with the work, she started looking into other options. After being laid-off, Janet quickly worked towards becoming a veterinary technician with the intention helping animals improve their mobility and quality of life. After graduating from Community College of Denver and becoming a CVT, she worked in a small animal hospital, then in canine rehabilitation. In her free time, Janet most enjoys hiking in the Colorado mountains with her husband, Rick, and their golden retriever, Bueller.

Dr. Felix Duerr
OrthoPets Orthopedic and Sports Medicine Consultant

Dr. Felix Duerr

Dr. Duerr earned his veterinary degree in Germany. He completed his internships in Saskatoon, Canada followed by his surgical residency/master’s program at Colorado State University. Dr. Duerr is the only practicing small animal veterinarian in Colorado that is double boarded by both the American College of Veterinary Surgeons (ACVS) and the American College of Veterinary Sports Medicine and Rehabilitation (ACVSMR). He worked in private practice for four years prior to joining Colorado State University in 2011. Dr. Duerr’s research focus is clinical studies aimed at improving animal health and quality of life related to orthopedic problems. His clinical interests include sports medicine and rehabilitation, cranial cruciate ligament injury including the investigation of alternative treatment methods, injury prevention, minimally invasive surgery (arthroscopy) and arthritis. Current research projects include the development of novel gait analysis techniques, evaluation of new treatment options for arthritis (surgical and non-surgical), and investigation of techniques to enhance bone healing. Dr. Duerr joined the OrthoPets team as their Orthopedic and Sports Medicine Consultant in the fall of 2014.

Jorden Hobbs BA
Communications Coordinator OrthoPets United

Jorden Hobbs BA

Jorden is a Colorado native who came to OrthoPets after a long stint working in the world of independent bookstores. She spends most of her free time riding horses and training them for the sport of equestrian vaulting, which combines dance and gymnastics moves on the back of a moving horse. She also enjoys reading, photography, baking, and spending time with her cat Bertie.

Rachel Dickinson BS
OrthoPets Fabrication Team

Rachel Dickinson BS

Rachel is a 3rd generation Colorado native. She earned a degree in Criminal Justice and Criminology with the intent of being an animal cruelty investigator. After an internship, she found the cases to be too heartbreaking. In 2005, she moved on to work at Denver Dumb Friends League as an intern to become a veterinary technician. She then moved her journey to low-income veterinary clinics and enjoyed helping families with financial constraints with their beloved animals. In 2012, Rachel joined the OrthoPets team!

Josh Luebbers
OrthoPets Fabrication Team

Josh Luebbers

Josh is a native to Colorado. He worked in the human field of orthotics for several years and decided to bring his knowledge from the human field to the animal field by joining the OrthoPets team in 2009.

Josh’s personal interests include playing various styles of music on both the electric and upright bass. He also enjoys spending time with his family, cats, and long drives to the mountains.

Robert Loa
OrthoPets Fabrication Team

Robert – OrthoPets Fabrication Team

Robert is a Texas native. He was born and raised in Houston. A lover of animals, Robert grew up with a beloved Chihuahua. Circumstances offered him the opportunity to begin working in the veterinary field when he started working at his first veterinary clinic. After working in the veterinary field for 2 years Robert found himself in a veterinary rehab clinic assisting the physical therapist. After working in the animal field for 7 years in Texas, Robert and his family decided to make the move to Colorado.

Robert enjoys spending time with his wife, daughters, Rosy, the Puggle, and Lady, the miniature poodle! They enjoy going camping, fishing, hiking,, and biking. He also enjoys watching sports with the guys!

Michael Hall
OrthoPets Fabrication Team

Michael Hall

Mike was born and raised in Topeka, Kansas. He received his BFA from the Kansas City Art Institute where his focus was on different mediums of sculpture. After college, he moved to SW Colorado to enjoy mountain life. In 2013, he decided to use his artistic abilities and hand skills to work in the human field of orthotics and prosthetics. His love of animals, the outdoors and mountains helped bring him to OrthoPets.

Mike’s personal interests include spending time with family, friends and his dog, “Whiskey.” He enjoys being active outside and furthering his artistic skills.

Jennifer Purcell
OrthoPets Fabrication Team

Jennifer Purcell

Jennifer has an MFA in Sculpture from NY State College of Ceramics at Alfred University. As an educator, she gained experience in 3D modeling, for use in animation, game design, and 3D printing. She is a native Carolinian, having moved to Colorado recently getting the chance to apply her love of animals, and passion for craftsmanship, to animal orthotics and prosthetics.

She enjoys working on her own artwork and spending time exploring the outdoors with her pit bull mix, Henry, and her partner Abby.

Vanessa Sandoval
OrthoPets Fabrication Team

Venessa is a Colorado native!
Venessa loves all animals, but her favorite are cats! Venessa enjoy spending time with her family, traveling, and attending concerts.

Venessa loves being a positive influence to others, and living life to the fullest! Venessa is excited about being part of the OrthoPets team, and she finds it very rewarding.