Faculty / Staff


Photo:Verena Affolter, DVM, ECVP. PhD, Professor Clinical Dermatopathology

Verena Affolter, DVM, PhD, DECVP, Professor Clinical Dermatopathology (Chief of Service)

Special Interests: Dermatopathology and immunology/immunopathology

Dr. Verena Affolter is board-certified in Veterinary Pathology and specialized in Veterinary Dermatopathology. She received her DVM from Switzerland in 1982. After completing her doctoral thesis, she continued her training in veterinary pathology at the University in Bern, Switzerland and at the Cornell University, where she specialized in pathology of skin diseases. After completing her PhD in Comparative Pathology at UC Davis, she accepted a faculty position in anatomic pathology. Her current areas of research are histiocytic diseases in cats and dogs, lympho-proliferative diseases of the skin and progressive lymphedema in draft horses. Dr. Affolter enjoys the close teamwork with the Dermatology Service, consulting on dermatologic cases submitted by referring pathologists, as well as teaching students and residents, and contributing to continual education of veterinarians. Together with Dr. Peter Moore, she leads the Leukocyte Antigen Biology Laboratory. Spending recreational time with her horse and dog are important to her.

Photo: Stephen M. Griffey, DVM, PhD

Stephen M. Griffey, DVM, PhD

Special Interests: Comparative pathology, lab animal pathology and cancer

Photo: Denise Imai, DVM, PhD, DACVP

Denise Imai, DVM, PhD, DACVP

Special Interests: Comparative pathology, Diagnostic pathology, Experimental pathology, Phenotypic analysis of transgenic mice, Pathology of non-domestic animals with a special interest in fish

Photo: Kevin Keel, DVM, PhD, DACVP

Kevin Keel, DVM, PhD, DACVP

Special Interests:  Behavior associated cranial abscesses in white-tailed deer; pathogenesis of white-nose syndrome and techniques to reduce mortality among bats; novel canine parvoviruses and emerging enteric disease in raccoons and cats; epidemiology and pathogenesis of a novel orthomomyxovirus affecting common eiders; environmental factors associated with mass strandings of lesser shearwaters

Rebekah Keesler, DVM, DACVP

Rebekah Keesler, DVM, DACVP

Special Interests: Primate pathology

Photo: Charles Mohr, DVM, PhD, Diplomate ACVP

Charles Mohr, DVM, PhD, DACVP

Special Interests:  Biochemical and cellular pathology

Photo: Mai Mok, DVM, DACVP


Special Interests: Forensic pathology

Photo: Peter Moore, BVSc, PhD, Diplomate ACVP

Peter Moore, BVSc, PhD, DACVP

Special Interests:  Leukocyte biology, immunopathology and lymphomas

Photo: Brian Murphy, DVM, Diplomate ACVP

Brian Murphy, DVM, PhD, DACVP

Special Interests:  Molecular aspects of lentiviral pathogenisis, signal transduction, cytokine biology, molecular aspects of oncogenesis, bone pathology, gene therapy

Dr. Brian Murphy is interested in general mammalian and nonmammalian pathology. He has a special interest in infectious disease, orthopedic pathology and oral pathology, with a particular interest in odontogenic tumors. His laboratory research involves the study of mechanisms of lentiviral pathogenesis.

Katherine Olstad, DVM, DACVP

Katherine Olstad, DVM, DACVP

Special Interests: Primate pathology

Photo: Patricia A. Pesavento, DVM, Ph.D.

Patricia A. Pesavento, DVM, PhD, DACVP

Special Interests:  Research diagnostics and outbreak investigation in shelter animal medicine; pathology of infectious diseases

Dr. Patricia Pesavento divides her time between the diagnostic pathology service and her research interests in the identification and characterization of naturally occurring infectious diseases that arise from intensively housed animals (such as those in the shelter environment). Dr. Pesavento received her PhD in 1997 from Harvard University and her DVM from UC Davis in 2000. She has been a pathologist on faculty with the Department of Pathology, Microbiology, and Immunology since 2005.

Photo: Rachel Reader, DVM, PhD, DACVP

Rachel Reader, DVM, PhD, DACVP

Special Interests:  Primate pathology

Photo: Kevin Woolard

Kevin Woolard, DVM, PhD, DACVP

Special Interests:  Neuropathology, comparative glioma biology, cancer stem cells, neural stem cells


Photo: Robert Higgins, BVSAc, MS, PhD, Diplomate ACVP

Robert Higgins, BVSAc, MS, PhD, DACVP

Special Interests: Neuropathology

Photo: Linda Lowenstine, DVM, PhD, DACVP

Linda Lowenstine, DVM, PhD, DACVP

Special Interests:  Non-domestic, avian, marine mammal and primate pathology and infectious diseases

Photo: N. James MacLachlan, BVSc, Ph.D.

N. James MacLachlan, BVSc, MS, PhD, DACVP

Special Interests:  Viral pathogenisis, reproductive and gastrointestinal pathology

Dr. N. James Maclachlan is a professor of Pathology and director of the Equine Viral Disease Laboratory. He earned his veterinary degree from New Zealand’s Massey University, MS in Microbiology from the University of Missouri, and PhD in Comparative Pathology from the University of California. Dr. Maclachlan is a diplomate and past-president of the American College of Veterinary Pathologists, and he served for 10 years as inaugural chair of UC Davis’ Department of Pathology, Microbiology and Immunology. His research is focused on viral diseases of livestock that impact international commerce, including bluetongue, African horse sickness, and equine viral arteritis. He is author or co-author of several books and more than 200 peer-reviewed publications, book chapters and reviews. Dr. Maclachlan has served as an expert to numerous organizations including the World Organization for Animal Health (OIE), the US Departments of Agriculture and Homeland Security, the European Union, and the Grayson - Jockey Club Foundation.

Photo: Dennis Wilson, DVM, MS, PhD, DACVP

Dennis Wilson, DVM, MS, PhD, DACVP

Special Interests: Toxicologic pathology, pulmonary pathology and hepatic pathology


Sebastion Carrasco – Resident III, Laboratory Animal Track

Charles Alex – Resident III, Zoo & Wildlife Track

Sarah Stevens – Resident III, Standard Track

Molly Liepnieks - Resident II, Laboratory Animal Track

Wesley Siniard - Resident II, Zoo & Wildlife Track

Katherine Watson - Resident II, Standard Track

Melissa Roy - Resident I, Laboratory Animal Track

Devinn Sinnott - Resident I, Zoo & Wildlife Track

Elizabeth Rose - Resident I, Standard Track



Anatomic Pathology Service Manager

Photo: Becky Griffey

Becky Griffey

VM3A, room 1345, 752-1369, rmgriffey@ucdavis.edu

  • Administers the day to day operations of the pathology service and the Histology laboratory.
  • Develops and implements new policies and procedures.
  • Schedules year round clinical duty, rounds and seminars for all faculty and residents.
  • Supervises clerical, technical and student support staff.
  • Oversees pathology residents and senior student rotations.
  • Residency application coordinator and web manager.
  • Facility and safety manager.

Administrative Office Staff

Kelly Arce

Kelly Arce

VM3A, Room 1346, 752-1368, kaarce@ucdavis.edu

Accessions, billing, clerical duties and carcass inventory management.

Photo: Barbara Fowler

Barbara Fowler

VM3A, room 1346, 752-1368, blfowler@ucdavis.edu

Accessions, billing, clerical duties, carcass inventory management and purchasing.

Necropsy Technical Staff

Photo: Matt Nichols

Matt Nichols

VM3A, room 1341, 302-7573, mbnichols@vmth.ucdavis.edu

Necropsy assistant, tissue and skeleton harvesting technician, facility maintenance, pet cemetery assistance, cleaning and supply custodian, veterinary and student employee instruction, and cooler inventory.

Taylor Coggeshall

Taylor Coggeshall

VM3A, Room 1346, 752-1368 taycoggeshall@ucdavis.edu

Necropsy assistant, tissue harvesting technician, facility maintenance, pet cemetery assistance, cleaning and supply custodian, wet tissue archive manager and cooler inventory.

Histopathology Laboratory Staff

Photo: Craig Glenn

Craig Glenn

VM3A, room 1326, 752-3462, clglenn@ucdavis.edu


Photo: Christopher Kwong

Victor Masih

VM3A, room 1326, 752-3462, mailto:vmasih@ucdavis.edu


Photo: Amber Villarreal

Amber Villarreal

VM3A, room 1326, 752-3462, avillarreal@ucdavis.edu

Lead Histotechnician, specializing in Immunohistochemistry