Dr. Mackie graduated from the Cornell University College of Medicine in 1974, then he fulfilled his medical residency at Dartmouth Medical Center.  From 1979 to 1981, he served a cardiology fellowship at the University of Utah.  He later received nuclear cardiology training at Wausau Hospital Center in Wisconsin and at the Mallinkrodt Institute in Cleveland. 

Dr. Mackie is Assistant Clinical Professor of Medicine at the University of Utah Medical School and has co-authored several articles for medical journals.  He was inducted into Phi Beta Kappa and Alpha Omega Alpha Honor Societies.  He has served as president of Utah Young Physicians section of the Utah Medical Association, chairman of the Utah Environmental Health Committee, and co-chairman of the American Society of Laser Medicine and Surgery Association's cardiovascular section.  He is also a Fellow of the American College of Cardiology.

Dr. Mackie grew up in Cooperstown, New York.  He and his wife have one daughter.  When recently asked what was his favorite thing to do, he quickly replied "I like going home!"  Dr. Mackie enjoys sailing, running marathons and, in his spare time, volunteers as a ski patroller.