Dr. Brennen grew up in Niagara Falls, NY with six siblings. His father was a physician, which sparked Dr. Brennen’s interest in medicine. This combined with his affinity for animals, led him to choose his career when he was very young.
After graduating from Cornell with a B.S. in 1985, he earned his Doctor of Veterinary Medicine from the same institution in 1990 and moved to Seattle where he was an associate at a progressive small animal hospital for 4 years. When Dr. Brennen decided he would like to raise his family in New York, he began looking for a quality practice in New York State to purchase. In 1994, he became the owner of Lake Road Animal Hospital, a hospital that has provided exemplary care since its establishment over 60 years ago.