Internal Medicine Doctors

Dr. Sherwood Johnson

Sherwood Johnson

DVM, Diplomate, ACVIM (Internal Medicine)

Dr. Sherwood Johnson earned an undergraduate degree in chemistry from Pomona College in 1989. After a year in England performing foot and mouth disease vaccine research, he returned to obtain his veterinary degree from North Carolina State University in 1994. After completing a year of internship at Michigan State University and a three-year residency in internal medicine at The Ohio State University College of Veterinary Medicine in 1998, he moved to Boston to pursue a Ph.D. in cancer biology at Harvard Medical School. In 2000, Dr. Johnson became a Diplomate of the American College of Veterinary Internal Medicine and founded the internal medicine service at Massachusetts Veterinary Referral Hospital. He moved to Pittsburgh in 2004 to be closer to family and to establish Veterinary Medical Specialists of Pittsburgh, Inc. (now known as PVSEC-Internal Medicine).

Dr. Johnson has a wide range of clinical interests and skills, with particular interest in urinary disease, immune-mediated disease, oncology/chemotherapy, endocrinology, ultrasound, endoscopy and cytology.

When he is not working, Dr. Johnson enjoys family, sports, the outdoors, fishing, sailing, music and woodworking. Dr. Johnson was married in 2000 (his wife is also a veterinarian), and has two sons, three dogs, three cats and many fish.

Tracey Peterson

DVM, Diplomate, ACVIM (Internal Medicine)

Dr. Tracey Peterson has worked with the PVSEC Internal Medicine department since 2009, under the name of Dr. Tracey Jackson.  She married in 2011 and changed her professional name to Dr. Tracey Peterson.

Dr. Peterson obtained a degree in agriculture from Kansas State University in 2001 and a Doctor of Veterinary Medicine degree from Kansas State University College of Veterinary Medicine in 2003.  Following graduation, Dr. Peterson completed a one-year small animal rotating medicine and surgical internship at Colorado State University Veterinary Medical Teaching Hospital.  After her internship, she completed a three-year residency in small animal internal medicine at Kansas State University and subsequently became a Diplomate of the American College of Veterinary Internal Medicine in 2008.  She was employed as a faculty member of Kansas State University College of Veterinary Medicine before pursuing a veterinary career in private practice.  Dr. Peterson became an associate doctor at PVSEC in 2009.

Dr. Peterson possesses diverse clinical interests and skills.  Her interests include endocrinology, immune-mediated disease, gastrointestinal, liver and renal disease in addition to infectious diseases.  She is highly skilled in respiratory and gastrointestinal endoscopy including non-invasive foreign body retrieval.  She also has extensive experience in abdominal ultrasonography, bone marrow aspirates and core biopsies and both esophageal and endoscopically-guided gastric feeding tube placement.

In her free time, Dr. Peterson enjoys outdoor activities with her husband and their dogs.

Dr. Emily Klosterman

Emily Klosterman

DVM, MS, Diplomate ACVIM (Internal Medicine)

Dr. Emily Klosterman is originally from Cincinnati, Ohio and attended The Ohio State University as an undergraduate.; After earning a Bachelor of Science degree in zoology, Dr. Klosterman remained at The Ohio State University to pursue her Doctor of Veterinary Medicine degree Following veterinary school, Dr. Klosterman completed a small animal rotating medicine and surgery internship at Purdue University. She continued her post-doctoral work at Purdue, earning a Master's degree in veterinary clinical sciences while completing an internal medicine residency. Dr. Klosterman's clinical interests include nephrology, diseases of the lower urinary tract and endocrinology. Dr. Klosterman presented her research on renal aspirates and nephrotic syndrome at American College of Veterinary Internal Medicine forums in recent years, and received the ACVIM Resident Research Award (Nephrology/Urology) for her Nephrotic Syndrome research.

When not at work, Dr. Klosterman is a self-professed "News Junkie" and enjoys gardening, reading, traveling and spending time with her two cats.

Dr. Lisa Sepesy

Lisa M. Sepesy


Dr. Sepesy is a native of Pittsburgh, who completed her undergraduate degree at Allegheny College and her Master’s of Public Health at the University of Pittsburgh.  Dr. Sepesy then earned her veterinary degree at the University of Pennsylvania.  After several years in general practice, she then completed an oncology internship at Purdue University, followed by an internal medicine residency at Cornell University.  Dr. Sepesy’s clinical interests are diverse, including oncology, and hematology, as well as endocrine and liver disorders.

Dr. Sepesy enjoys swimming, boating and biking in her free time, and shares her home with two golden retrievers, “Emma” and “Piper” and a cat named “Andy”

Rachel Smith


Dr. Smith was born and raised in Princeton, New Jersey. Her undergraduate degree in biochemistry was earned at Northeastern University in Boston, Massachusetts. She then completed her veterinary degree at the University of Pennsylvania in Philadelphia. 

Following veterinary school, Dr. Smith completed a small animal rotating internship at Angell Animal Medical Center in Boston, and was recognized for her strong medicine skills, leadership and compassion, receiving a peer nominated award. 

From there, Dr. Smith ventured off the East Coast and moved to St. Paul, Minnesota to complete her residency in Internal Medicine at the University of Minnesota. During her residency, Dr. Smith developed her interests for gastrointestinal disease, endocrinology and clinical teaching, and attained the position of Chief Resident. 

Dr. Smith is excited to join PVSEC in August 2017, moving back closer to home in another great sports town. Her interests outside of work include hiking with her Labrador, Payton, traveling to see family and friends, and attending sporting events, especially baseball and football.

Support Staff

Clinical Supervisor
Amber Lynch

Hospital Treatment Technicians
Clinical Co-Managers
Stephanie Cates