William Dermot Colleran (April 26, 1925 – February 28, 2022), better known as Mac Martin was an American bluegrass musician.

[1] William "Mac Martin" Colleran used to listen to "hillbilly music" on WWVA and WSM Grand Ole Opry when he was young.

In the mid 1950s, Colleran got together with Mike Carson and Billy Bryant and, by 1957, the Dixie Travelers was formed.

[1] The newly formed group began performing at Walsh's Lounge in Pittsburgh, Pennsylvania and did so until 1976.

[1] Musicians such as Earl Banner, Slim Jones, Frank Batista, Norm Azinger, Bud Smith, Keith Little,Bobby Martin (Colleran), Tim Custer, Brad Foust and Bob Artis have all been part of the Dixie Travelers.