Returning to Harvard Medical School, Coons continued his work on immunohistochemistry, in collaboration with Louis Fieser—an organic chemist—and his colleagues. Before the war, they had been successful in coupling anthracene isocyanate—a fluorophore—to antipneumococcus antibodies. The resulting product retained its immunological function, and was capable of agglutinating pneumococcal bacteria. In addition, the organisms were brightly fluorescent and could be seen easily with a microscope that was fitted with an excitational
ultraviolet light source. This basic laboratory paradigm was later applied to many antigens and antibodies, launching the clinical disciplines of diagnostic immunofluorescence microscopy for bacteriology and immunology, immunocytology, and
immunohistochemistry in anatomic pathology. These methods are widely used today, globally, in clinical medicine and
cell biology. Many scientists spent time as fellows in Coons's Harvard laboratory. They, in turn, further developed the technique of immunohistology, as applied to electron microscopy and light microscopy. Coons progressed through the academic ranks at Harvard Medical School, and in 1953 was appointed Career Investigator for the
American Heart Association. He completed additional work on
in vitro and
in vivo antibody production and the condition of immunological "tolerance". In recognition of his achievements, Coons was given the prestigious Albert
Lasker Award in Basic Research in 1959. Coons was admitted as a member of the
National Academy of Sciences in 1962. In 1970, he was given a named Harvard University Chair in the Department of Bacteriology and Immunology, and later, in the Department of
Pathology. He was president of the
American Association of Immunologists (1960–1961) and a councillor and president of the
Histochemistry Society, and was given several other awards and international honorary academic degrees. Despite those accolades, Coons remained a modest, affable, and quiet person who was devoted to his work, family, friends, and students. ==Personal life==