Singer and musician in the pop rock band Hanson with his brothers Taylor and Zac Hanson.
He plays both the electric and acoustic guitar, as well as synths, bass, and piano.
He and his younger brother Taylor Hanson are both in Hanson and helped create the brother's beer brand, MMMhop IPA.
His first name is Clarke, but he goes by his middle name, Isaac. He and his brothers founded their eponymous band in 1992.
He married Nicole Dufresne on September 30, 2006 and they had two children together.