Jeremy Creelan, the Cuomo administration’s point man on good-government issues, is leaving at the end of the year to rejoin his old law firm.

Creelan, the governor’s special counsel to the governor (a promotion from his former post as special counsel for Public Integrity and Ethics Reform), will become a partner at the firm, Jenner and Block LLP.

He joined the administration in 2011, having been recruited from the Brennan Center, where he was the deputy director and at the time best known for authoring the widely read report on the state’s dysfunctional Legislature.

A Cuomo administration official said Creelan is leaving for “family considerations.”

During his time with Cuomo, a new ethics package was negotiated and approved that required broader disclosure of outside income for state elected officials, as well as the creation of a new lobbying and ethics regulator, the Joint Commission on Public Ethics (otherwise known as JCOPE).

But Creelan’s departure also comes as the governor will likely make another attempt at passing an ethics reform bill in 2014 following a spate of corruption scandals this year that saw three lawmakers arrested in separate cases.

Cuomo in the last year unsuccessfully sought the public financing of political campaigns as well as more aggressive enforcement at the state Board of Elections.

Cuomo has indicated he will push for some of the recommendations made his Moreland Commission on Public Corruption, which include reform of the state’s campaign finance laws.

Aside from serving as a liaison for the governor with the state’s good-government advocates, Creelan is credited with helping to develop the online voter registration component of the DMV website.

Jeremy has been an invaluable member of my administration, critical to enacting landmark ethics reform and helping this state build back better after Superstorm Sandy,” Cuomo said in a statement.

“But after taking a hiatus from his law firm to serve the people of New York, he must now return to the private sector.”

I have worked with Jeremy on and off for almost fifteen years and look forward to working with him again in the future. I wish he and his family the best in this next chapter.”

Creelan worked on Cuomo’s failed 2002 gubernatorial campaign. He also served as deputy director of the Democracy Program at NYU School of Law’s Brennan Center for Justice, where he co-authored a 2004 report that deemed the Legislature the nation’s worst state government body.