Lois Stainman is a left-of-center philanthropist. She is the wife of Arthur Stainman, a managing director at the asset management firm First Manhattan Company. She is the vice president of the Stainman Family Foundation, a grant-making foundation created by her husband in 1998 to make contributions to left-of-center organizations.
Lois Stainman was born on February 10, 1942.  She attended Columbia University, and received a master’s degree in social work in 1968.  In 1987, she began work at the Metropolitan Museum of Art in New York City as a researcher and lecturer in the museum’s American Paintings and Sculpture Department. 
Stainman is the fifth-largest donor to People for the American Way, a social-liberal organization that seeks to limit the spread of right-of-center principles and ideas. The organization also seeks to elect left-of-center candidates to elected office.  While People for the American Way is not required to reveal its donors, it has released a statement that lists Stainman as having contributed a total of $566,717 to the organization. 
Lois Stainman has contributed to various Democratic Party candidates, aligned political action committees (PACs), and Democratic Party congressional election committees. Stainman has consistently made political contributions in various elections over the past twenty years, beginning with a $500 contribution to the Democratic National Committee (DNC) in 2000. 
Stainman is a longtime supporter of former Secretary of State Hillary Clinton, donating to her 2008 presidential campaign ($2,300), the 2013 Ready for Hillary super PAC ($12,500), and the 2016 Hillary for America PAC ($2,700).  In recent years, Stainman has contributed to the Planned Parenthood Action Fund PAC ($5,0000), the EMILY’s List PAC ($250), the 2020 Joe Biden Victory Fund ($2,500), and the 2020 Biden for President Campaign Fund ($2,500). 
In 2020, Stainman also made political contributions to various Democratic Party candidates, including failed U.S. Senate candidates Jaime Harrison ($500), Steve Bullock ($500), and Sara Gideon ($1,000).  Stainman also contributed $500 to U.S. Senator John Hickenlooper’s (D-CO) successful campaign.