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.


Daniel Baker

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

“As a member of the Professional Services Veterinary team, I have the unique opportunity to partner with practices and positively affect thousands of pet’s lives!”

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. Debera A. Butler meet the team
Dr. Robert Duquette meet the team

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.”

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. David C. Duvall meet the team
Dr. Sheryl Gamble meet the team

Sheryl Gamble

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

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

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. Jeanne Goodfellow meet the team
Dr. Laura Greene meet the team

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.”

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. Erin Hatcher meet the team
Dr. Camille Heersche meet the team

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.”

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. Sharon Hubby, bio picture with her favorite friend
Dr. Nikhil Joshi meet the team

Nikhil Joshi

VMD, Sr. 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.”

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. Blythe Jurewicz with her furry best friend

Todd Knappenberger

DVM, Professional Services Veterinarian South Central Region

“It’s humbling to get to work for a company and with a network of individuals who are so dedicated to science, animal health, and the veterinary profession.”

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. Diane McDonald meet the team
Dr. Debra Olbrich meet the team

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.”

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. Marck Pelham meet the team
John Rehak, MBA, DVM

John Rehak

MBA, DVM, Associate Director,
Veterinary Professional Services
South Area

“Being a member of the Merck Professional Services Veterinary team is a wonderful opportunity to support the veterinary profession by providing education and solutions to advance companion animal healthcare.”

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. Kieth Rohrer meet the team
Dr. Joel Sailor meet the team

Joel Sailor

DVM, Associate Director,
Veterinary Professional Services

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

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. Jennifer Scata
Staci Scolavino, VMD

Staci Scolavino

VMD, Associate Director,
Veterinary Professional Services
Central Zone

“At Merck Animal Health, I get to work with an incredible team that is passionate about dogs and cats living long, healthy lives. The health and wellbeing of not only companion animals but those who take care of them are what drives us each and every day.”

Keri Shaver

DVM, Sr. Professional Services Veterinarian
Carolinas Region (NC)

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

Dr. Keri Shaver meet the team
Dr. Matthew Stevens meet the team

Matthew Stevens

DVM, Sr. Professional Services Veterinarian
Midwest Region (KY, IN, IL)

“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.”

Taylor Tillery

DVM, Veterinary Academic & Industry Liaison Lead Veterinary & Consumer Affairs

“We have great diversity of thoughts and opinions from some very intelligent veterinary teammates that push me to always work harder, think differently and be better.”

DVM, Veterinary Academic & Industry Liaison Lead Veterinary & Consumer Affairs
Dr. Meg Warner meet the team

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.”

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. Christina Wheeler meet the team


Duane E. Chappell

Associate Director
Equine Pharmacovigilance and Professional Services

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

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.

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.

Cara Wright

Senior Equine Professional
Services Veterinarian

Dr. Wright’s areas of interest include sports medicine and adjunct therapies, geriatric horses, and emergency care.

Phil van Harreveld

Senior Equine Professional
Services Veterinarian

Dr. van Harreveld’s areas of interest include lameness examination, soft tissue surgery, reproductive surgery, management of medical and surgical equine colic.


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