Dr. Westveer began his career in medicine twenty-eight years ago in southeast Michigan. He founded a private practice in cardiology at the Northpointe Heart Center in 1986, employing thirteen physicians engaged in the evaluation and treatment of heart disease. He has also served as vice-chief of cardiology at William Beaumont Hospital in Royal Oak, Michigan for over 10 years before becoming chairman of the division of cardiology at the Troy Beaumont Hospital five years ago. The Beaumont system is currently amongst the largest cardiology providers in the country and has been named regularly in the U.S. News and World Report's top fifteen hospitals in cardiac care. He has led the development of a full service cardiology division engaged in cardiac intervention, electrophysiology and cardiac surgery.

He has been a driving force on hospital administrative committees, regional health care advisory committees, and was an active member of the Beaumont Board of Directors from 1999-2006.