AHS Activities Administrator Tim Wallace made the announcement in a press release Thursday.
Baker has coached basketball at Alliance High School for 13 seasons, seven as freshman and Junior Varsity coach, and the last six as Head Coach.
Baker also lead the Bulldogs to their last State Tournament appearance in 2008.
In the press release Wallace said, “His commitment to the program will be greatly missed.”
Baker is a native of Harrison and graduate of Sioux County High School and played college basketball at Doane College in Crete.
He has also coached at Atwood High School in Kansas and Wheeler Central High School in Bartlett, NE.
Baker will continue to teach in the Social Studies department and stay involved in coaching.