Dexter Gilman Wansel (born August 22, 1950) is an American keyboardist, raised in Philadelphia, ‎Pennsylvania. He contributed to the development of the Philly Sound and worked with producers ‎Gamble and Huff at Philadelphia International Records. Wansel led the musical group, Yellow ‎Sunshine. He has worked with Phyllis Hyman, The Jacksons, MFSB, Teddy Pendergrass, Patti ‎Labelle, Grover Washington Jr. and Lou Rawls amongst many others.‎

http://en.wikipedia.org/wiki/Dexter_Wansel