is he involved in any other work besides composing songs?
Yes, as a producer.
Norman Whitfield
Norman Jesse Whitfield (May 12, 1940 – September 16, 2008) was an American songwriter and producer, who worked with Berry Gordy's Motown labels during the 1960s. 
who sang i heard it thru the grapevine Gladys Knight & the Pips by whom was it composed? Norman Whitfield and Barrett Strong was it a part of any album? No, the first recording was released as a single. by whom was it produced? Norman Whitfield what is the song about? The lyrics tell the story in the first person of the singer's feelings of betrayal and disbelief when he hears of his girlfriend's infidelity only indirectly "through the 'grapevine'". has it been recorded by other musicians as well? Yes, "the Miracles". did it win any accolades? It was also inducted to the Grammy Hall of Fame, placed 81 on the "Rolling Stone" list of The 500 Greatest Songs of All Time. where is the composer from? UNANSWERABLE does the former composer also have a record label to his name? Yes, Whitfield Records.
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Norman Whitfield [SEP] Introduction
Norman Jesse Whitfield (May 12, 1940 – September 16, 2008) was an American songwriter and producer, who worked with Berry Gordy's Motown labels during the 1960s. He has been credited as one of the creators of the Motown Sound and of the late-1960s subgenre of psychedelic soul. During his 25-year career, Whitfield co-wrote and produced many enduring hits for Motown artists, including "Ain't Too Proud to Beg", "(I Know) I'm Losing You", "I Heard It Through the Grapevine", "Cloud Nine", "I Can't Get Next to You", "War", "Ball of Confusion (That's What the World Is Today)", "Just My Imagination (Running Away with Me)", "Smiling Faces Sometimes", and "Papa Was a Rollin' Stone".