The Doppler Effect was established with a lot of heart, a bit of luck, and a healthy dose of chutzpah in 2022.

Having served for many years in the local GP and referral environment of Southern Maine, we know what you need.

Lee Gregory DVM

Dr. Gregory has been practicing veterinary medicine in Maine since 2008. She has been performing ultrasounds throughout her veterinary career, and considers herself lucky to have had the mentorship of several expert local ultrasonographers (Lee Garrod DVM, DACVECC; Karin Wagner DVM, DACVIM; Bob O’Brien DVM, DACVR). As the traveling ultrasonographer at The Doppler Effect, she performs complete cardiac and abdominal ultrasound studies on cats and dogs. She maintains a strong interest in general practice, and still “pulls shifts” in the ED at an area referral hospital.

Bryan Bottorff DVM, DACVIM

Dr. Bottorff received his Doctor of Veterinary Medicine degree from Purdue University in 2008. He then completed a rotating small animal internship at the Virginia-Maryland Regional College of Veterinary Medicine and began his Cardiology residency at Oregon State University in 2009. Dr. Bottorff completed his residency and obtained board certification by the American College of Veterinary Internal Medicine in Cardiology in 2012.

Since that time, Dr. Bottorff has practiced high quality medical and interventional cardiology in private practice throughout the Pacific Northwest. He also has extensive experience in telemedicine and remote cardiology, serving as a consultant cardiologist for various ultrasound and imaging groups since 2014.

Robert T. O’Brien DVM, MS, ACVR

Dr. O’Brien obtained his DVM from Ohio State University and completed his residency in radiology at the University of Pennsylvania. He was a major in the US Army and a veteran of the Gulf War. He was on faculty at the universities of Wisconsin, Kansas State, and Illinois throughout an active academic career. He has over 100 peer-reviewed published manuscripts. He is an international expert in contrast ultrasound and advanced CT imaging. He founded the International Veterinary Ultrasound Society. He was on the examination committee of the ACVR for 5 years.