Cerritos Veterinarians

We invite you to explore the biographies of our doctors and learn more about them. Our doctors have a wide variety of backgrounds and interests.

  • Dr. Ronald Morein

    Medical Director
    Veterinary School: University of California, Davis

    Dr. Ronald Morein graduated from the School of Veterinary Medicine at the University of California at Davis in 1966. He entered private practice in the San Gabriel Valley working primarily with dogs and ...
    Read Full Biography

  • Dr. Cynthia Ribarich

    Associate Veterinarian
    Veterinary School: Cornell University

    Cindy Ribarich, D.V.M. earned her Bachelor of Science degree in Animal Science with Honors from Cornell University’s College of Agriculture and Life Sciences. In 1991, she was conferred the degree of ...
    Read Full Biography

  • Dr. Denise Bierens

    Associate Veterinarian
    Veterinary School: Ross University School of Veterinary Medicine

    Dr. Denise Bierens was born and raised in Canada. She went to veterinary school at Ross Uiversity and completed her clinical training at the University of Missouri. Dr. Bierens worked for two years at ...
    Read Full Biography

  • Dr. Gregory Hargenrater

    Associate Veterinarian
    Veterinary School: University of California, Davis

    Dr. Hargenrater graduated form the University of Southern California with degree in Biology and Chemistry in 1998. He then went on to attend the school of Veterinary Medicine at UC Davis, tracking

    ...
    Read Full Biography

  • Dr. Roberto Marchan

    Associate Veterinarian
    Veterinary School: Ross University School of Veterinary Medicine

    Dr. Roberto Marchan was born and raised in San Juan, Puerto Rico. He went to veterinary school at Ross University and completed clinical training at the University of Missouri. Dr. Marchan worked for two ...
    Read Full Biography

  • Dr. Ryan Smith

    Associate Veterinarian
    Veterinary School: Western University of Health Sciences
    Graduate School: University of Minnesota, Twin Cities

    Ryan Smith graduated from the College of Veterinary Medicine at Western University of Health Sciences. Following veterinary school, Ryan completed a 1-year rotating internship in small animal surgery and ...
    Read Full Biography

  • Dr. Stephanie Zinsser

    Associate Veterinarian
    Veterinary School: University of Pennsylvania

    Dr. Stephanie Zinsser graduated from Cornell University with a Bachelors of Science in Animal Science with a focus in reproduction and research.  She attended the School of Veterinary Medicine

    ...
    Read Full Biography
CLOSE CLOSE