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Bayer, Rosemary (D)

State Senator District 12
Office: 3600 Binsfeld Building
Term: First
Phone: (517) 373-2417
Home Address: PO Box 215106, Auburn Hills, MI 48321
Seat Number: 1
Standing Committees: Environmental Quality(VC), Appropriations
Subcommittees: K-12 and Michigan Department of Education(VC), Natural Resources and Environment, Great Lakes, and Energy, Transportation
(C) = Chair, (VC) = Vice Chair

BB - Binsfeld Building,  BT - Boji Tower,  CB - Capitol Building,  HOB - House Office Building  


Sen. Bayer was elected to the Michigan Senate's 12th District in 2018.  She won 100 percent of the Democratic primary after two other candidates withdrew from the race.

In the November general election, she defeated former Rep. Mike MCREADY after she secured 49.39 percent of the vote to McReady's 48.61 percent. 


In 2009 she co-founded ardentCaus L3C, an information technology company.  It serves the nonprofit sector with affordable, state of the art data products and services.  The company seeks to help raise the effectiveness of nonprofits in the health care and social services field. 

To read MIRS biography of Sen. Bayer, click here.


Sen. Bayer holds a B.S. in computer science and mathematics from Central Michigan University and an M.B.A., with distinction, from Lawrence Technological University. 

Sen. Bayer also serves on the board of NonProfit Enterprise At Work (NEW) in Ann Arbor. 


Sen. Bayer and her husband John have lived in the 12th Senate District over the course of their 30-year marriage, first in Orion and Addison Township, now in Beverly Hills. 


Sen. Bayer is co-founder and past executive director of the Council of Women in Technology Foundation (MCWTF). The foundation provides STEM programming and support for girls and women around Michigan through educational programs, scholarships, summer camps and after-school clubs. 


Katie Reiter
Cell Phone: 517-373-5217

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