Here’s a pair of exhibition posters 1967-1968 for Glaser’s dear friend, abstract painter Frank Roth (1936-2019). Glaser pulled forms from Roth’s work for the central poster images. Roth, also a longtime former SVA instructor, passed away in 2019.  
While looking at some contact sheets of the Push Pin office in the mid-1960s, I came across a few photos of Roth, including this one of him goofing on Glaser’s recent Dylan poster. Perhaps Roth was visiting to discuss plans for his posters?
In 1964, Glaser designed an exhibition announcement for a Roth exhibition at the Borgenicht Gallery in New York (shown at the top of this post), again working within Roth’s color vocabulary to bridge the gap between his friend’s work and his own.

Ten years later, in 1974, Milton designed a poster for a Frank Roth exhibition at Gimpel & Weitzenhoffer Gallery using similar color gradients, but this time in more subdued shades.

This post also appears in PRINT.