Former longtime Citigroup banker Mike Heffernan will be the next commissioner for the Massachusetts Department of Revenue, state Administration and Finance Secretary Kristen Lepore announced.

He will lead the agency responsible for the state's tax, child support, and municipal finance laws on May 2.

Kevin Brown, the department's general counsel, will be acting commissioner from April 4 until Heffernan's start date.

Heffernan succeeds Mark Nunnelly, whom Gov. Charlie Baker appointed executive director of the Massachusetts Office of Information Technology's executive director, also effective April 4.

"Mike's financial services experience and commitment to public service make him an ideal commissioner," Baker said in a statement.

Heffernan was the Republican candidate for the state treasurer's office in 2014, losing to Deborah Goldberg in the open-seat race.

Baker last year appointed Hefferman to the MBTA Retirement Board and Pension Reserves Investment Management Board.

Heffernan has more than 25 years of experience in financial services, capital markets and entrepreneurship.

He spent nearly two decades in increasingly senior roles at Citigroup's markets and banking division, where he oversaw its seven U.S. regional distribution offices in institutional equities. He co-founded tech startup Mobiquity Inc. in 2011.

Previously, he was a managing director at Salomon Brothers and spent the early part of his career with NatWest Markets and EF Hutton & Co.

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