[1] In 1975, Lindner began working at American Financial Group, which his father had bought two years prior.

He became a director and co-president of American Financial in 1996 and additionally was elected as the co-chief executive officer along with his brother S. Craig Lindner in January 2005.

[3] In 2015, Lindner was involved in co-founding soccer club FC Cincinnati, and is the chief executive officer and majority owner.

[4] Speaking about the success and high attendance the club received in its inaugural season, general manager Jeff Berding said, "What has happened is directly attributable to having Carl and the Lindner family as our majority owners.

[6] Lindner was appointed to the Kennedy Center Board of Trustees in March 2019 by President Donald Trump.