Meet the Professional Services Veterinary Team

Merck Animal Health has professional services veterinarians that cover the US from coast to coast with wide range of expertise. Get to know them, both professionally and personally. Find and connect with the team member that supports your needs.


Dr. Brad Berlekamp

RPh, DVM, Associate Director, Veterinary
Professional Services Central Area

“It is a true pleasure to be a part of the Merck Animal Health team, and working in an environment where growth and development are built into everything we do.”

Dr. Debera A. Butler

Sr. Professional Services Veterinarian
Mountain States Region (AZ, CO, ID, MT, NM, NV, UT, WY)

“My favorite part of being a veterinarian for Merck Animal Health is visiting my alma mater, CSU. I get the honor of lecturing to students and collaborating with faculty, some of which taught me.”

Dr. Robert Duquette

PhD, BVSc, MRCVS, Associate Director, Veterinary
Professional Services West Area

“It’s such an honor to be part of such a diverse and talented Team. Not a day goes by without me learning something new and exciting about the latest innovations across the veterinary field – not only for companion animals, but for all animals.”

Dr. David C. Duvall

DVM, Sr. Professional Services Veterinarian
Ohio Valley Region (NY, OH, PA)

“It was my life-long dream to become a veterinarian and improve the lives of animals. Becoming a veterinarian was the only occupation I ever considered.”

Dr. Sheryl Gamble

MS, DVM, Sr. Professional Services Veterinarian
Southeast Region (FL, GA)

“Animals love unconditionally. We should be more like them.”

Dr. Matthew Goetz

DVM, MBA, Sr. Professional Services Veterinarian,
Animal Welfare Organizations Team National

“I love the fact that all my customers do their best every day with the resources they have available in order to make a positive impact on the animals in their community.”

Dr. Jeanne Goodfellow

DVM, RN, Sr. Professional Services Veterinarian
South Florida Region (FL)

“I enjoy getting to know other veterinarians and staff at the hospitals that I visit. After many years of working together to help them achieve their goals, a bond of trust forms.”

Dr. Joseph Hahn

DVM, MA, BBA, Executive Director of the
US Companion Animal and Equine Professional Services

“In my role at Merck Animal Health, I am able to help veterinarians, and that equates to helping animals in a different and exciting way. My ability to reach and impact a larger audience means I can help more pets live healthier lives.”

Dr. Sharon Hubby

VMD, Professional Services Veterinarian
Tri-State Region (CT, NJ, NY)

“I grew up with 14 dogs, 50 rats, 3 mice, 2 gerbils and a bunny. My desire to become a veterinarian began at a very early age and I never considered any other career.”

Dr. Nikhil Joshi

VMD, Professional Services Veterinarian
Mid-Atlantic Region (DC, DE, MD, PA)

“I am proud to be working with such accomplished, passionate, hard-working, and friendly people.”

Dr. Blythe Jurewicz

DVM, Professional Services Veterinarian
Northern California and Hawaii Region (CA, HI)

“Caring for and bonding with my patients and the people who care for them is one of the most rewarding parts of being a veterinarian.”

Dr. James R. Kallman

DVM, Sr. Professional Services Veterinarian
South Central Region (AR, KS, MO, OK)

“The best parts of my day have animals in them; the worst is when I have to say goodbye to a beloved family member.”

Dr. Christopher A. Lee

DVM, MPH, DACVPM, Sr. Professional Services Veterinarian
Southern California Region (CA)

“The deeper we dive into veterinary medicine, the more interweaved with other species, and fascinating we find one animal to be, the human. This profession helps animals and people to enrich each other’s lives further.”

Dr. Debra Olbrich

DVM, MS, Sr. Professional Services Veterinarian
Great Lakes Region (IA, IL)

“I can’t imagine my life without animals. They provide unconditional love to us and I get such a great feeling inside knowing that I can help that animal live a long and comfortable life.”

Dr. Mark Pelham

DVM, Sr. Professional Services Veterinarian
Gulf Coast Region (AL, LA, MS, TN)

“What I enjoy most about being a veterinarian is being part of that human-animal bond and helping those that can’t help themselves.”

Dr. Keith Rohrer

DVM, Professional Services Veterinarian
Michiana Region (IN, MI, OH)

“Bonding with pets and their families through all life stages is the most rewarding aspect of this noble profession.”

Dr. Keri Shaver

DVM, Professional Services Veterinarian
Carolinas Region (NC, SC)

“I love being able to partner with our colleagues to help them achieve their visions within their practices.”

Dr. Dominique Sims

DVM, Professional Services Veterinarian
Pacific Northwest Region (AK, OR, WA)

“I have wanted to be a veterinarian since I was three years old. My earliest memory is attending my family dog’s vaccine appointment and being so amazed that this kind of profession existed.”

Dr. Nicole Sinclair-Torre

VMD, MBA, Associate Director, Veterinary
Professional Services East Area

“As a Professional Services Veterinarian, you can positively impact so many animals through education and conversations with numerous veterinary healthcare team members.”

Dr. Matthew Stevens

DVM, Sr. Professional Services Veterinarian
Shenandoah Valley Region (KY, VA)

“Growing up, we had every type of critter there was. Dogs and cats to birds and iguanas. I always enjoyed not only our pets, but also the interactions with our veterinarian and the staff.”

Dr. Charine Tabbah Ahmed

DVM, Sr. Professional Services Veterinarian
New England Region (CT, MA, ME, NH, NY, RI, VT)

“Most of us become veterinarians because of our love of animals, but one of the best parts of the job is the relationships you form with your clients over time.”


Dr. Fairfield T. Bain

Associate Director of Strategic Development
and Innovation – Equine

Dr. Bain’s areas of interest include diagnostic ultrasound in critical care, perinatology and neonatal intensive care, cardiovascular disorders, cytopathology and surgical pathology, dermatology and dermatopathology, and hyperbaric oxygen therapy.

Dr. D. Craig Barnett

DVM, Director Equine Veterinary
Professional Services

Dr. Barnett’s areas of interest include infectious disease, preventative care and vaccinology, dentistry, sports medicine and lameness, and parasitology.

Dr. Duane Chappell

DVM, Associate Director Equine
Pharmacovigilance and Professional Services

Dr. Chappell’s areas of interest include reproduction, dentistry, infectious disease, preventative care, vaccinology and biosecurity.

Dr. Bryant Craig

DVM, Senior Equine Professional
Services Veterinarian

Dr. Craig’s areas of interest include reproduction, sports medicine and lameness, herd health, infectious disease, preventative care and vaccinology.

Dr. Earl Gaughan

DVM, DACVS, Senior Equine Professional
Services Veterinarian

Dr. Gaughan’s areas of interest include sports medicine and lameness, young, growing horses, equine surgery, infectious disease, preventative care and vaccinology.

Dr. Chrissie Schneider

DVM, MS, DABVP, CVMA, Senior Equine Professional
Services Veterinarian

Dr. Schneider’s areas of interest include infectious disease and preventive care, ophthalmology, emergency care in the field and acupuncture.


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