Kinnear was born on June 17, 1963, inLogansport,Indiana, to Suzanne (née Buck), a homemaker, and Edward Kinnear, a career diplomat who worked for theUS State Department.[2][3][4] He has two older brothers, James (born 1957) and Steven (born 1959). He is ofScottish-Irish descent.[5] Kinnear grew up a "Foreign Service brat", having moved around frequently, fromBeirut toAthens. While a student at theAmerican Community Schools in Athens, Kinnear first ventured into the role of talk show host with his radio showSchool Daze With Greg Kinnear.[5] Returning to the United States for a university education, he attended theUniversity of Arizona, graduating in 1985 with a degree inbroadcast journalism. While there, he was a member of theAlpha Tau Omega fraternity.[6]
Kinnear hosted a short-livedgame show,College Mad House, which was spun off from the kids' showFun House. He became the creator, co-executive producer and host ofBest of the Worst, which aired from 1991 to 1992. In 1991, Kinnear became the first host ofTalk Soup, which he hosted until 1995, when he left the show for theNBC late-night talk showLater with Greg Kinnear (1994).
In 2010, he starred as the estranged father ofMiley Cyrus' character inThe Last Song. In 2011, Kinnear starred in the miniseriesThe Kennedys playing the lead role asJohn F. Kennedy. It was originally planned to air on theHistory Channel; however, it was announced in January 2011, that the miniseries had been pulled from that network.[7] It was subsequently picked up byReelzChannel and first aired on April 3, 2011. Kinnear played a famous novelist inJosh Boone's directorial debut filmStuck in Love, which followed his relationships with his former wife (Jennifer Connelly) and teenage children.[8]
On March 9, 2023,Netflix announced that Kinnear will guest star in Part 2 of Season 4 ofYou as Tom Lockwood, the father of Joe Goldberg’s (Penn Badgley) latest love interest, Kate Galvin (Charlotte Ritchie).[9]