During the 1970's and 80's Alex had regular one-man shows in New York at the Kornblee Gallery, owned by Jill Kornblee.

She had discovered his work through his exhibitions at the Felicity Samuel Gallery in London, and the first exhibition was a collaboration between the two.

His Kornblee Gallery shows got rave reviews in The New York Times.

Alex became lifelong friends with fellow Kornblee artist Donn Moulton. They were both upset when the gallery folded without paying its artists, but were amused when they were advised to invoke a US law protecting 'children, artists and incompetents', and were immediately paid in full.