Jeffery Christopher Klemm (born May 23, 1987), known professionally as Mr. Jeff and Jeff Klemm, is an American singer, songwriter, record producer, and content creator. He makes children's music, and is a member of The Recording Academy.
Klemm was born and raised in Northeast Ohio and now resides in Cuyahoga Falls. His brother is songwriter and record producer Drew Louis. He has three children. He married Jillian Klemm in 2020. Klemm told Ideastream that he decided to get sober after the birth of his first son in 2016.
Klemm got his start performing in bands around the Akron, Ohio, area. In February 2022, Klemm was on The News with Shepard Smith to speak on the third-party settlement organizations tax laws regarding services like Venmo and Zelle.
In 2024, Klemm debuted his first children's music as Mr. Jeff, with his debut album Wonderful Wonderful Wonderful. Later that year, he got an honorable mention for the single "Loud In the Library" for the International Songwriting Competition children's music award. In June 2024, he became a member of The Recording Academy.
In August 2025, he released his third studio album, Big Kid Stuff, featuring children's musicians Miss Jessica, Fyütch, Ronnie Boy Kids, Tara Trudel, and Mega Ran. In 2025, he joined the board of directors at the Children's Music Network. Klemm was named as a 2025âÂÂ2026 Music Incubator Artist for Cleveland Rocks by the Cleveland Foundation. In May 2025, he worked on a track for Fyütch's album Harmony, which won the Grammy Award for Best Children's Music Album in January 2026.
All credits adapted from Apple Music and Spotify.