In 1924, Harrison joined the American Society of Zoologists and in 1933, he joined the Beaumont Medical Club. He was a member of Anatomische Gesellschaft ("Anatomical Society" in German) from 1934 to 1935 and became chair of section F for the American Association for Advancement of Science in 1936.
In 1924, Harrison joined the American Society of Zoologists and in 1933, he joined the Beaumont Medical Club. He was a member of Anatomische Gesellschaft ("Anatomical Society" in German) from 1934 to 1935 and became chair of section F for the American Association for Advancement of Science in 1936.