Selected other interviews - an oral history interview from 1969 for the Archives of American Art - here
More recently, Adrian Searle interviews Alex for The Guardian here (2012), and, this past August, Kim Heirston visits his studio and "shares inspirations, methodologies, and stories".
The "New York School" and poetry connection - Andrew Epstein's exemplary Locus Solus blog has two useful posts on that (the latter connecting to Matthew Sperling's illuminating interview in Apollo magazine) - here and here
Not forgetting the 1978 portfolio, "The Face of The Poet"
Here's a miscellany of Alex Katz paintings and images
and four more of Allen
[Alex Katz. Allen Ginsberg, 1986. Oil on linen. 48 x 144 inches.]