People / Matthew D. Hennessey

Person · House

Matthew D.
Hennessey

CHIEF OF STAFFOffice of Senator Elissa Slotkin

Works forDElissa Slotkin · Democratic · Michigan

Chief of Staff for U.S. Senator Elissa Slotkin (D-MI) since January 2025. Previously served as Chief of Staff in Slotkin's House office (2021-2024) and as Campaign Manager for her successful 2020 and 2022 re-election campaigns. Founded and is a partner at Onward Strategies LLC, a consulting firm. Has over a decade of experience in government, electoral politics, and economic development, including service as Special Assistant to the Federal Co-Chair of the Appalachian Regional Commission under President Obama, and prior work in renewable energy sector.

Last year's salary

$111,886

Calendar year 2025

Career tenure

4.4y

4 roles tracked

Sponsored trips

2

$12,061 total

Career earnings

$475,152

Chapter I

Compensation Timeline

Summed annual salary across all tracked roles.

Preparing salary timeline...

Chapter II

Employment History

Roles are merged across compensation filings.

CHIEF OF STAFF
Senate
Jan 3, 2025 to Sep 30, 2025
PART-TIME EMPLOYEE
Office of Representative Elissa Slotkin
forDElissa Slotkin · Democratic · Michigan 7th District
House
Apr 9, 2023 to Apr 23, 2023
CHIEF OF STAFF
Office of Representative Elissa Slotkin
forDElissa Slotkin · Democratic · Michigan 8th District
House
Jun 1, 2021 to Apr 8, 2023
LEGISLATIVE ASSISTANT
Office of Representative Elissa Slotkin
forDElissa Slotkin · Democratic · Michigan 8th District
House
May 17, 2021 to May 31, 2021

Chapter III

Earlier career

Prior roles per public sources. May overlap with employment records based on salary filings above.

Founding Partner
Onward Strategies LLC
Campaign Manager
Elissa Slotkin for Michigan
Chief of Staff
Office of U.S. Rep. Elissa Slotkin
Special Assistant to the Federal Co-Chair
Appalachian Regional Commission
Analyst and Executive Assistant
Hecate Energy
Founding Partner
Sunday Creek Horizons

Chapter IV

Sponsored Travel

2 trips · $12,061 combined disclosed value.

Unknown
Employee Reimbursed Travel
Feb 14, 2026 to Feb 20, 2026
Pending
Unknown
Employee Reimbursed Travel
Feb 14, 2026 to Feb 20, 2026
$12,061