Richard Diebenkorn holds a special place in my mind. He was an expressionist painter that moved to figures and landscapes and finally to the abstracts like the Ocean Park #79, 1975 show below.

The CBS Morning broadcast mentioned below is illuminating and revealing. Diebenkorn was not only a great artist, but a genuinely good man.
Ken

Richard Diebenkorn, Ocean Park #79, 1975 (Philadelphia Museum of Art, purchased with a grant from the National Endowment for the Arts and with funds contributed by private donors, 1977, 1977-28-1. © 2016 The Richard Diebenkorn Foundation)

View the broadcast:
CBS Sunday Morning broadcast, 1988

"A master of contemporary American art, Richard Diebenkorn (1922-1993) was noted for landscape paintings, thoughtful figure studies, and geometric abstracts.

In this report for "Sunday Morning," which originally aired on December 27, 1988, correspondent David Browning visited Diebenkorn's studio in California's Sonoma County, to discuss the artist's "trial and error" approach; and New York's Museum of Modern Art, where Diebenkorn was being celebrated by a one-man show of his drawings."

Here is another good resource for all things Diebenkorn: Richard Diebenkorn, Painter's Table