Dr. Jennifer Hennessey Bremseth, CVJ

Owner of the Animal ER of Northwest Houston, Dr Jennifer Hennessey-Bremseth has over 20 years of experience in emergency and critical care. Dr. Hennessey’s vision of an emergency practice designed and devoted to the customized care of both families and their pets lead her to develop the Animal ER in 2014.

A 2005 Cum Laude graduate of Texas A&M College of Veterinary Medicine, Dr Hennessey carries additional training as a Certified Veterinary Journalist with the American Society of Veterinary Journalists. Dr Hennessey is published in numerous magazines and journals, has a column in the Texas Veterinarian magazine, as well as is a frequent guest for Houston’s Fox 26, KPRC 2 News, Houston Life and Great Day Houston. Her professional interests include prevention of emergency illness, utilization of lipid emulsion for toxin exposure, and management of trauma patients.

Dr Hennessey serves on the TVMA Public Relations Committee as well as holds memberships with the Veterinary Emergency & Critical Care Society, the Harris County Veterinary Medical Association, the Texas Veterinary Medical Association, Veterinary News Network, the American Veterinary Medical Association, the American Association of Rehabilitation Veterinarians (AARV) , the International Association of Veterinary Rehabilitation and Physical Therapy (IAVRPT), the International Veterinarian Academy of Pain Management (IVAPM) and the International Sled Dog Veterinary Medical Association.

Off site, Dr Hennessey is actively involved with the Texas A&M College of Veterinary Medicine helping support their local emergency medicine society and works with vet students onsite at the ER through her externship and mentoring programs; she also serves on the TVMDL Advisory Council. Dr Hennessey, in 2014, enjoyed time as the Program Director at Pima Medical Institute and helped launch their new Veterinary Technician program. In 2015, Dr Hennessey was included as a veterinary advisor for a new project evaluating the nutritional care for dogs with cancer at the Keto Pet Sanctuary.

Outside of the ER, Dr Hennessey is a mother of two amazing kiddos and proud wife of Army Sergeant Major Greg Bremseth. Committed to her own health and well-being, Dr Hennessey is an International Bodybuilding Federation (IFBB) Professional athlete after winning the NPC Universe National Championship in 2018; she is also a dual pageant title holder as the current reigning Mrs Texas Legacy and Mrs Legacy Unites States, and co-owner of Crowned Regent Productions, LLC.

On a mission to stay connected and serve her local communities, Dr Hennessey has proudly partnered with the City of Houston and Harris County along with Precinct 5 as extension of care for seized animals, volunteering her expertise and services for the Harris County Animal Cruelty Task Force.

Roger L. Zinn, CVPM


Originally from Cypress, Texas, Roger Zinn has over 15 years of veterinary experiance in both general and emergency medicine. In 2014, he teamed up with Dr. Jennifer Hennessey Bemseth in her vision of opening and developing Animal ER.

Roger studied Animal Science at Sul Ross State University and Veterinary Technology at Cedar Valley College. He is also a graduate of Colorado State University’s Veterinary Management Institute with a masters certificate in Veterinary Business Administration through the College of Veterinary Medicine & American Animal Hospital Association. Roger has been published in several national magazines discussing various topics within the veterinary industry. He has held many titles within the realm of veterinary medicine including being an adjunct educator for the Veterinary Paramedic Program at Houston Community College for 7 years and has lectured for various pharmaceutical companies on relevant veterinary topics all over Texas. Roger holds memberships with the American Animal Hospital Association (AAHA), where he sits on an Advisory Board, the International Association of Veterinary Rehabilitation and Physical Therapy (IAVRPT), Veterinary Hospital Managers Association (VHMA), and the International Veterinary Emergency & Critical Care Society.

Roger enjoys music, art, and the theatre, but mostly spends his time away from the ER outdoors with his boxer named Warby.

ER Veterinary Staff

  • Elizabeth Mihalevich, DVM
  • Jack Ying, DVM
  • Stan Mikula, DVM
  • Bethany Smith, DVM
  • Sara Kaplan-Stein, DVM
  • Ann Anderson, DVM
  • Tara Prezioso, DVM
  • Amanda Soirez, DVM

Support Staff

  • Wendi Schroeder – ER Technician
  • Derik Wood – LVT, ER Technician
  • Sasha Jones – LVT, ER Technician
  • Chanda Shelton – LVT, ER Technician
  • Courtney Orgovan – ER Technician, Community Relations
  • Kayla Hower – ER Technician
  • Amanda Foster – Client Service Specialist