Dr. Bernard Long, our Co-Chief of Staff, began working at Hillcrest Animal Hospital in 1986. He completed undergraduate studies at St. John's University in Minnesota, and later studied veterinary medicine at the University of Illinois College of Veterinay Medicine. Dr. Long enjoys all aspects of veterinary medicine, including general surgery, diagnostics and ophthalmology.

In his free time, Dr. Long enjoys spending quality time with his family and being outdoors.

Dr. Alexandria Mercer, our Co-Chief of Staff, has been a veterinarian at Hillcrest Animal Hospital since 1995. She completed undergraduate studies at the University of Maryland, and veterinary studies at the University of Florida College of Veterinary Medicine. Professionally, she is most interested in internal medicine, particularly in the areas of endocrinology, cardiology and nephrology.

Outside of work, Dr. Mercer enjoys spending time with her husband and three children. Her hobbies include enjoying country living with her horses, goats, dogs, chickens and bees!

Originally from Fargo, North Dakota, Dr. Jerome Jallen attended North Dakota State University, where he studied microbiology and biology. While there he worked with the research facilities and became very interested in gross pathology and internal medicine. In 1996, Dr. Jallen obtained a Doctorate of Veterinary Medicine from Iowa State University's College of Veterinary Medicine. During vet school, he furthered his interest in pathology by working in the Clinical Pathology Lab for two years.

Mary Wilder, DVM with DogDr. Mary Wilder developed an interest in veterinary medicine while growing up on a farm in DeKalb, Illinois. She completed her pre-veterinary education at Kishwaukee College and Northern Illinois University. Dr. Wilder graduated from the University of Illinois College of Veterinary Medicine in 1988, and has worked as a veterinarian at Hillcrest Animal Hospital since 1995. Her professional interests include internal medicine, surgery and ultrasonography.

In her free time, Dr. Wilder assists the Hoo Haven Wildlife Rehabilitation facility. She also enjoys spending time with her husband, Randy, and her children, Mike and Amy. Her hobbies include crafts,especially wood-carving, reading and spending time outdoors.

Dr. Hall grew up in Decatur, MI. She received her undergraduate degree from Alma College in Alma, MI, and her veterinary degree from Michigan State University. Her special interests include dentistry and surgery.

Outside of work, Dr. Hall enjoys gardening, planted aquariums, and hiking. She has a yellow Labrador named Garro, three cats named Suki, Butterball and Velcro, an aquarium with goldfish, and a large planted tropical community tank.

Dr. Jill Sullivan grew up in Burlington, Iowa and currently resides in Rockford, Illinois. She received an undergraduate degree from Iowa State University and earned a DVM degree from the Iowa State University College of Veterinary Medicine. Prior to joining the Hillcrest Animal Hospital team, Dr. Sullivan practiced in Quad Cities. Her special interests include surgery, dermatology, and animal behavior.

Outside of the practice, Dr. Sullivan enjoys spending time with her husband, her chickens (a flock of 15 laying hens), gardening, and boating. She also has three dogs and a cat as pets.