There are multiple artist with this name:
1) Little Mack Simmons (January 25, 1933 — October 24, 2000) was an African American, Chicago blues harmonica player, singer and songwriter.
2) Ann Arbor aka. Little Mac is a chiptune artist from Michigan. Malcolm Simmons was born in Twist, Arkansas. In his youth he befriended James Cotton, and they grew up learning to play the harmonica. Simmons relocated to St. Louis, Missouri, at the age of 18 and worked on the railroad. At this time Simmons made his stage debut with Robert Nighthawk.