Hay was born in Faizabad, India, and moved to the Netherlands at the age of eight. He lived in Amsterdam and later in The Hague. In the summer of 1967, he joined the Golden Earrings, as they were then called, replacing Frans Krassenburg. Hay created the cover art for some of Golden Earring's albums.
He has also made two solo albums, Only Parrots Frogs and Angels (1972) and Victory of Bad Taste (1987), but both met with little success.