Dr. Keith Rohrer and furry friend

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. Debera A. Butler meet the team

Dr. Debera A. Butler

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

“One of my favorite parts 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 meet the team

Dr. Robert Duquette

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

“It’s an honor to be part of such a diverse and talented Team. Not a day has gone by that I haven’t learned new and exciting innovations across the veterinary field – not only in companion animals, but for all animals.”

Dr. David C. Duvall meet the team

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 meet the team

Dr. Sheryl Gamble

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

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

Dr. Matt Goetz meet the team

Dr. Matthew Goetz

DVM, MBA, 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 meet the team

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. Laura Greene meet the team

Dr. Laura Greene

DVM, DACVIM, Sr. Professional Services Veterinarian
Internal Medicine, National

“Veterinary medicine is such an exciting and innovative field, and I am at my happiest when able to share my enthusiasm for all the new ways we are able to help our pets live longer and healthier lives.”

Dr. Erin Hatcher meet the team

Dr. Erin Hatcher

DVM, Sr. Professional Services Veterinarian
Low Country Region (FL, GA, SC)

“Merck Animal Health’s commitment to animals and science continues to pave the way for new and innovative products.”

Dr. Josesph Hahn meet the team

Dr. Joseph Hahn

DVM, MA, BBA, Executive Director,
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. Camille Heersche meet the team

Dr. Camille Heersche

DMV, Sr. Professional Services Veterinarian
Texoma Region (TX, OK)

“As a veterinarian, you’re not working with animals so much as you are working with people. I love that part of the job, and at Merck Animal Health, I get to do that all the time.”

Dr. Sharon Hubby, bio picture with her favorite friend

Dr. Sharon Hubby

VMD, Sr. 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 meet the team

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 with her furry best friend

Dr. Blythe Jurewicz

DVM, Senior Professional Services Veterinarian
Northern California Region (CA)

“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 meet the team

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 meet the team

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. Diane McDonald meet the team

Dr. Diane McDonald

VMD, Professional Services Veterinarian
Bayou Country Region (TX, LA)

“I’ve been so impressed with Merck Animal Health as a company, and my teammates as individuals. Everyone cares about doing the right thing in support of customers, patients, and communities at large.”

Dr. Debra Olbrich meet the team

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. Marck Pelham meet the team

Dr. Mark Pelham

DVM, Sr. Professional Services Veterinarian
Gulf Coast Region (AL, FL, 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. Kieth Rohrer meet the team

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. Joel Sailor meet the team

Dr. Joel Sailor

DVM, Sr. Professional Services Veterinarian
Corporate and Strategic Accounts, National

“Merck Animal Health maintains a culture of science, collaboration, and integrity.”

Dr. Jennifer Scata

Dr. Jennifer Scata

DVM, CCRT, Sr. Professional Services Veterinarian
Central Texas Region (TX)

“I have always admired Merck Animal Health as a company because their values about animal well-being are closely aligned to my own.”

Dr. Keri Shaver meet the team

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. Nicole Sinclair Torre meet the team

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 meet the team

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

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. Meg Warner meet the team

Dr. Margaret Warner

DVM, MS, Sr. Professional Services Veterinarian
North Central Region (WI, MN, ND, SD, NE)

“Merck Animal Health is as passionate about veterinarians and veterinary medicine as I am.”

Dr. Christina Wheeler meet the team

Dr. Christina Wheeler

DVM, Professional Services Veterinarian
Shenandoah Region (VA, WV)

“As a veterinarian, I feel fortunate to be part of a profession that affords me the opportunity to constantly learn. What I love most about being part of the Merck Animal Health Team is the commitment to the veterinary community through science and education.”


Dr. Fairfield T. Bain

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. Duane Chappell

Dr. Duane Chappell

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

Dr. Bryant Craig

Associate Director, Scientific Sales Affairs
Lead for Equine Professional Services and Pharmacovigilance

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

Dr. Chrissie Schneider

Dr. Chrissie Schneider

DVM, MS, DABVP (Equine Practice), 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.


Use the contact form to get in touch with the livestock Technical Services team.