Senator
Mark Spreitzer
| Seat | Senate District 15 |
|---|---|
| Party | Democratic |
| Capitol office | Room 108 South · State Capitol |
| Mailing address | State Capitol Room 108 South, P.O. Box 7882, 2 E. Main St., Madison, WI 53707 |
| Capitol phone | 608-266-2253 |
| Legislative assistant | Doug Hyant, Katherine Iliff, Amanda King, Christina Lieffring |
| Write to | sen.spreitzer@legis.wisconsin.gov (official address) |
| Hometown | Beloit |
| Tenure | Serving since January 3, 2023 (also served Assembly 2015 to 2022) |
| Term limited | No term limits |
Committees 3
Bills, 2025 to 2026 session 548 as principal author · 0 as coauthor
- MeasureTitleStatusMomentum
- SJR 21Relating to: honoring the life and public service of Senator Timothy Francis Cullen.Enacted100
- SJR 6Relating to: honoring the life and enduring legacy of Robert George Uecker.Enacted100
- SB 136Relating to: school bus back-up lamps.Enacted100
- SB 181Relating to: a levy limit exemption for regional emergency medical systems and eligibility for the expenditure…Enacted100
- SB 267Relating to: the fee for filing limited liability company articles of organization with the Department of Financial…Enacted100
- SB 387Relating to: indication of veteran status of certain service members on operators’ licenses or identification cards.…Enacted100
- SB 392Relating to: driver education instruction related to school bus safety.Enacted100
- SB 504Relating to: dental provider network rental by insurance plans.Enacted100
- SB 531Relating to: postloss assignment of rights or benefits under property insurance policies to residential contractors and…Enacted100
- SB 575Relating to: sexual assault forensic examination compensation.Enacted100
- SB 96Relating to: exempting certain electric vehicle charging stations located at a residence from the electric vehicle…Enacted100
- SB 521Relating to: highway signs for the Mount Horeb Veterans Memorial. (FE)Enacted100
- SB 556Relating to: providing utility aid payments for certain energy storage facilities. (FE)Enacted100
- SB 822Relating to: allowing discounts for prompt payment of health care fees.Enacted100
- SB 748Relating to: sales tax exemption certificates for the sale of precious metal bullion. (FE)Enacted100
All 548 bills as principal author ›
Bills and sponsors: Open States bulk data (public domain dedication), 2026-10-public.pgdump; status is read from the official actions. About the momentum score
Effectiveness 2025 to 2026 session
100th percentile
| Bills & joint resolutions authored | 546 |
|---|---|
| … passed committee / chamber / both | 100 / 61 / 32 |
| … became law | 31 |
| Carried in the other chamber (became law) | 0 (0) |
| Points vs. Senate minority average | 441 ÷ 160.60 = 2.75 |
| Most-authored topics | Business, jobs & the economy (179), State government & agencies (151), Budget & taxes (149) |
Senate rankings · How the score works. A count of bill progress, not a judgment of the member's work.
Closest allies co-authorship, 2025 to 2026
Most bills written together
- Melissa Ratcliff DSenate 16 405
- Kelda Roys DSenate 26 370
- Chris Larson DSenate 7 362
- Dianne Hesselbein DSenate 27 305
- Kristin Dassler-Alfheim DSenate 18 292
- Tim Carpenter DSenate 3 241
- LaTonya Johnson DSenate 6 216
- Sarah Keyeski DSenate 14 208
- Jeff Smith DSenate 31 204
- Dora Drake DSenate 4 202
“Written together” = 2025 to 2026 session bills and joint resolutions on which both are principal author or coauthor (measures with more than 60 sponsors are left out). Sharing bills does not imply a personal or political alliance.
District 15
- Counties
- Jefferson, Rock, Walworth
- Find your district
- Who represents me?
- Assembly members sharing a county
- Tyler August (31), Amanda Nedweski (32), Robin Vos (33), Will Penterman (38), Brienne Brown (43), Ann Roe (44), Clint Anderson (45), Joan Fitzgerald (46), Cindi Duchow (97), Barbara Dittrich (99)
Official district map: see the official Senate page.
Lobbyist reports naming this member 2025 to 2026
No lobbyist expenditure reports naming this member are in our data.
Registered lobbyists and the organizations they represent are on our sister site, the Wisconsin Lobby Guide.
A reported expenditure is a legal, disclosed activity and does not imply wrongdoing.
Source
Copied from https://docs.legis.wisconsin.gov/2025/legislators/senate/2827 on November 2, 2026, through Open States people data (CC0), checked against official legislature rosters. Not endorsed by the Wisconsin State Senate.