Diana Mannino is originally from Warren, Michigan. She earned a bachelor’s degree in finance from Oakland University and a master’s degree in corporate finance from Walsh College. She also completed post-graduate coursework at the University of Wisconsin–Milwaukee and Harvard University. She lives in Rochester Hills.

Diana is the president of HBPO’s North American operations, an automotive supplier. She previously worked as HBPO’s North American director of finance and controlling. Before joining HBPO in 2015, she held finance and management roles with Johnson Controls, Intertec Systems, General Motors, and Delphi Automotive Systems.

Diana's campaign for Rochester Hills City Council Member, District 1 is her first entry into politics.