GCSI ranked #1 lobby firm in Lansing!

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Firm Abstract

For more than a quarter century, GCSI has cultivated a reputation for top-shelf political advocacy by working closely with the...


Communication / Briefing Reports

GCSI lobbyists communicate regularly with clients. Sometimes it is daily; other times it...

Diligence. Creativity. Connections. Results. GCSI clients get all that and more from the best team... Click image to activate the Client Panel.

Advocacy Style


It’s a simple word that constitutes GCSI’s historical nucleus … a phrase that connotes cooperation and working in the spirit...

Ranking Michigan Lobbyist / Firms

Respondents to the last five surveys of state lobbying clout – conducted by MIRS political newsletter in 2011, 2009, 2007,...

Association Services

GCSI launched GCSI Association Services (GCSIAS) in 1992 to give government stakeholders heightened identity at the Capitol without the cost...

get in touch with GCSI

Governmental Consultant Services Inc.

One Michigan Avenue
120 N. Washington Square, Suite 110
Lansing, Michigan 48933
517-484-6216 (voice)
517-484-0140 (fax)
info@gcsionline.com (email)


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