Harry Callahan, the influential American photographer who studied and taught at the Institute of Design in Chicago (also known as the New Bauhaus, founded by Maholy-Nagy) invited friend and colleague Aaron Siskind to join the faculty. Both photographers went on to teach at Black Mountain College and the Rhode Island School of Design (RISD). Their work both informed and influenced one another, and they enjoyed a long friendship. While at RISD, Callahan also taught Ed Sievers, who then went on to teach Mike Mandel at California State University at Northridge. Mike Mandel created iconic bodies of work during the 1970’s and later partnered with colleague Larry Sultan to create Evidence, one of the most important photography books ever published.
https://loeildelaphotographie.com/en/robert-mann-gallery-friends-family-dv/
The Eye of Photography