Feinberg was also appointed by the Commonwealth of Massachusetts to administer the One Fund—the victim assistance fund established in the wake of the 2013 Boston Marathon bombings.

Feinberg was hired by The Boeing Company in July 2019, to oversee distribution of $50 million to support 737 MAX crash victim families.

[6] Appointed by Attorney General John Ashcroft to be Special Master of the fund, Feinberg worked for 33 months entirely pro bono.

He developed the regulations governing the administration of the fund and administered all aspects of the program, including evaluating applications, determining appropriate compensation and disseminating awards.

[9] In his book titled What is Life Worth?, Feinberg described the eight-part plan which was applied to approaching the September 11 Victim Compensation Fund.

On July 5, 2007, a Virginia Tech press release said that Feinberg would work pro bono as the chief administrator to the Hokie Spirit Memorial Fund (HSMF).

[11][non-primary source needed] On June 10, 2009, Feinberg was appointed by the U.S. Treasury Department to oversee the compensation of top executives at companies which have received federal bailout assistance.

[13] Treasury Secretary Timothy Geithner, in a statement about Feinberg's rulings on executive pay, said, "We all share an interest in seeing these companies return taxpayer dollars as soon as possible, and Ken today has helped bring that day a little bit closer.

[18] Feinberg has come under harsh criticism[19][20] from public interest groups for refusing to disclose the amount of his compensation or the details of his arrangement with the company.

[21] On December 6, 2010, the Center for Justice & Democracy (CJ&D) sent a letter[22] to Robert Dudley, the CEO of BP, concerning "serious new issues raised about the lack of transparency and potential conflicts of interest related to the administration of the Gulf Coast Claims Facility."

This failure to release the terms of all these financial arrangements under circumstances of tremendous historic and public significance is simply unacceptable.On September 12, 2012, Feinberg was hired by Penn State University to aid in the settlement of dozens of personal injury claims against the institution stemming from the sex abuse scandal involving Jerry Sandusky.

[24] Feinberg oversaw the disbursement of donations to the injured victims and families of the deceased in the Aurora, Colorado, movie theater shooting that left 12 people dead and 70 others wounded.

[26] On April 1, 2014, General Motors announced it had retained Feinberg to handle part of its response to a widely reported product safety recall.

GM said Feinberg would serve as a consultant "to explore and evaluate options in its response to families of accident victims whose vehicles are being recalled for possible ignition switch defects.

"[27] The U.S. Department of the Treasury released proposed and temporary regulations to implement the Kline-Miller Multiemployer Pension Reform Act of 2014, as required by Congress.

Feinberg will oversee Treasury's implementation of Kline-Miller, including the review of applications to determine whether they meet the requirements set by Congress.

[37] In 2019, Feinberg worked pro bono to mediate the impasse between representatives of factions within the United Methodist Church regarding its position on homosexuality.