Something interesting I learned reading his entry in the Songwriters Hall of Fame, is that he was a "White House Consultant for the Arts" during the Kennedy and Johnson Administrations. He also did work for the Kennedy Center.
One of Adler's most famous songs, written with Ross and popularized by Tony Bennett, is "Rags to Riches." Here's how it begins:
I know I'd go from rags to riches
If you would only say you care
And though my pocket may be empty
I'd be a millionaire.
My clothes may still be torn and tattered
But in my heart I'd be a king
Your love is all that ever mattered