Dan Tyminski is a bluegrass composer, vocalist, and instrumentalist. He is a member of the band Alison Krauss and Union Station and has released two solo albums, Carry Me Across the Mountain (2000), on the Doobie Shea Records label, and Wheels (2008), on the Rounder Records label.

Daniel Tyminski, who plays guitar and sings for Alison Krauss + Union Station, remains one of the most dynamic and talented performers on the bluegrass scene. Although he had already earned a strong following, Tyminski found himself in the media spotlight after providing the singing voice for George Clooney in O Brother, Where Art Thou? His performance of "I Am a Man of Constant Sorrow" won single of the year honors at the 2001 CMA Awards and a 2001 Grammy for country collaboration of the year. Including his tally with Union Station, he has won 10 Grammys.

Before becoming a member of Union Station in 1994, Tyminski played mandolin and sang in the Lonesome River Band. Tyminski's love and feel for traditional bluegrass didn't come from growing up in the southern Appalachians but rather in Vermont. He credits his brother Stan with getting him hooked on the guitar and mandolin at the age of 6. While Stan was in the Navy and home on leave, he left his mandolin with his younger brother. Tyminski attributes his love for traditional bluegrass to such musicians and singers as Del McCoury, Ricky Skaggs, Tony Rice, Larry Sparks and Jimmy Martin. In 2003, Rounder reissued Tyminski's solo album, Carry Me Across the Mountain, first released in 2000 by Doobie Shea Records.

With Union Station, Tyminski has participated in a string of highly regarded and commercially successful albums, including So Long So Wrong (1997), New Favorite (2001), Live (2001), and Lonely Runs Both Ways (2004). He also appears on the Krauss solo album Forget About It (1999) and on her multi-platinum 1995 compilation Now That I’ve Found You: A Collection, as well as 2007’s A Hundred Miles or More: A Collection