[3] In Rochester, Minnesota, from 1927 to 1944 Feldman was a veterinary research pathologist and an instructor of comparative pathology at the Mayo Foundation's Institute of Experimental Medicine.
[2] A 1944 paper by Feldman and H. Corwin Hinshaw played an essential role in developing antibiotics to treat tuberculosis.
[7] Feldman at the Mayo Clinic suggested to Selman Waksman to search for antibiotics that could effectively treat tuberculosis.
When Selman's student Albert Schatz learned about this he insisted that he should be allowed to work on an anti-tuberculosis drug, to which Waksman agreed.
[8] Under Waksman's direction, Schatz isolated, from the Rutgers Agriculture School's farm soil, a Streptomyces griseus strain that produced an antibiotic.
"He personally made all photographic illustrations for his publications, using a home-made device",[3] which he described in a 1929 article in the Archives of Pathology.
[12] Feldman made photographic portraits of many prominent physicians, especially pathologists, and medical researchers, including 14 Nobel Prize winners.