David McMillan is a former executive of Minnesota Power, where he served in a variety of roles from 1989 to 2018. He received a bachelor of arts degree in economics and history from the University of Minnesota Duluth and a law degree from the University of Minnesota.
McMillan currently serves as chair of the Saint Lawrence Seaway Development Corporation Advisory Board and previously served as the board chair of the Minnesota Chamber of Commerce, the Natural Resources Research Institute, the Area Partnership for Economic Expansion, and Goodwill Industrial Vocational Enterprises. Active in his community, he is a past member of the Duluth Entertainment Convention Center's Board of Directors and the Board of Directors of St. Luke's Hospital. McMillan previously served as Chair of the Board of Regents.