McNamee is also a touring musician, first as a founding member of the Flying Other Brothers, and more recently in that group's follow-on band, Moonalice.

When McNamee was 12 years old, he protested against the Vietnam War, and volunteered for Eugene McCarthy's campaign for president.

[7] In a move atypical for mutual funds, he made venture capital investments in Electronic Arts (which went public in 1989) and Sybase (which had its IPO in 1991).

[15] Roger has written for, and played guitar, bass, and vocals in the band since 2007, using the stage persona of "Chubby Wombat Moonalice.

[21] In August 2012 the Rock and Roll Hall of Fame announced that the digital logs for "It’s 4:20 Somewhere" had been acquired for its library and archives, describing the Moonalice logs as helping to "...tell the story of music’s digital revolution; specifically the rise of direct-from-artist (DFA) distribution.

[22][23] McNamee has expressed his support for tougher antitrust enforcement policies in the US and internationally, particularly as it relates to leading technology firms, supporting the antitrust enforcement actions by the DOJ and the FTC led by Lina Khan under President Biden’s administration which has taken a tougher stance on blocking anticompetitive mergers.

[25][26] Roger McNamee is a member of the Wikipedia Foundation's advisory board, and acts "as a special advisor to the executive director on business and strategy issues.

McNamee had prepared for them a curriculum, stating that the real problem was the divisions social media platforms were creating among Americans, of which Adam Schiff, member of the House Intelligence Committee said, "Roger was really ahead of the curve.

[29] An early investor in Facebook, McNamee became very critical of its impact on society and democracy,[12] as expressed in his op-eds for USA Today and The Guardian.

[34] In May 2019, he appeared before the House of Commons privacy and ethics committee in Ottawa, calling for governments to temporarily shut down Facebook and other social media sites until they reform.

The couple founded an elephant sanctuary in Tehama County, northern California, now known as Tembo Preserve.