His paternal grandfather,[citation needed] also called Glenn Calvin Wilhide, was the inventor of the first hand power drill, for the Black and Decker company in Towson, Maryland.
[1] Glenn Wilhide was a co-founder of the independent production company called ZED Ltd in 1985 and, with Sophie Balhetchet, produced documentaries, talk shows, and dramas.
Wilhide's first full producer credit was a feature film titled The Road Home (1985), directed by Jerzy Kaszubowski and shot in Poland for Channel 4.
Wilhide disbanded ZED Ltd in 1996, and began working as a freelance producer at Granada TV, developing projects primarily with Gub Neal in the drama department.
[citation needed] Wilhide produced the first series of The Royle Family (1998) starring Caroline Aherne and Craig Cash, which they co-wrote with Henry Normal.