Mr. Lewenza is National President of the Canadian Auto Workers union (CAW), the largest private sector union in Canada. He was born and raised in Windsor, Ontario and has been a member of CAW Local 444 since he began working at Chrysler Canada in 1972 at the age of 18.

He held the positions of committeeperson, chairperson, and vice president before taking on the role of Local 444 President in 1994.

He was the Chair of the CAW Chrysler Master Bargaining Committee for the last five rounds of Big Three bargaining. He was also a CAW National Executive Board member and the President of CAW Council for the past 10 years. He was an active delegate on the Windsor and District Labour Council, and a community leader in the Windsor-Essex.

He has been involved with many community organizations including the Motor City Credit Union, Guardian Board of Windsor, the labour-sponsored Community Development Group, Hotel Dieu Hospital Board, the AIDS Committee of Windsor, and United Way of Windsor-Essex County.