1953
Born to George E. and June V. (Witzman) MacKinnon in Highland Park, MI.
1979
Marries Nancy Keller-MacKinnon.
1981
Earns a Bachelor of Science in religious education from Rochester University.
1981
Earns a Bachelor of Science in human resources development from Oakland University.
1986
Becomes a licensed clinical psychologist.
1987
Achieves a Master of Arts in marriage and family therapy from Wayne State University.
1997
Obtains a Doctor of Philosophy in clinical psychology from the University of Detroit-Mercy.
1997
Works as a licensed clinical psychologist out of his practice, MacKinnon and Associates, through today.
1997
Teaches as a professor of psychology at Rochester University until 2021.
2005
Is the director of the MacKinnon Psychology and Counseling Clinic at Rochester University through today.
2005
Serves as chair of the Department of Psychology and Behavioral Sciences at Rochester University until 2020.
2014
Is honored as Distinguished Faculty of the Year at Rochester University.
2018
The MacKinnon Psychology and Counseling Clinic at Rochester University is named in his honor.
2020
Is named to Top Docs Psychologists.
2021
Is honored as emeritus professor of psychology at Rochester University.
2022
Receives the inaugural Faculty Excellence Award at Rochester University.