His first major academic appointment was at Johns Hopkins University, where he was also a regular columnist for the Baltimore Evening Sun newspaper.
Throughout his long scientific career, he held many distinguished academic titles, including Like his doctoral mentor H. J. Muller, Glass was deeply troubled by eugenics.
In response to the views of Charles Davenport, Morris Steggerda and others, Glass wrote an essay, "Geneticists Embattled: Their Stand Against Rampant Eugenics and Racism in America During the 1920s and 1930s" (1986).
The following excerpt is emblematic: "Let us remember that the genes which are passed down in the egg and sperm from one generation to another are simply molecules of DNA, selected over eons as providing individuals to survive in a real world and to reproduce when mature.
The contributors are ... of the very highest standard ... Workers in the large field of chromosomes, genes, nucleic acids and viruses will find the book essential.