When he graduated from Dartmouth, Just faced the same problems all black college graduates of his time did: no matter how brilliant they were or how high their grades were, it was almost impossible for black people to become faculty members at white colleges or universities. Just took what seemed to be the best choice available to him and accepted a teaching position at
historically black Howard University in Washington, D.C. In 1907, Just first began teaching
rhetoric and English, fields somewhat removed from his specialty. By 1909, however, he was teaching not only English but also Biology. In 1910, he was put in charge of a newly formed biology department by Howard's president,
Wilbur P. Thirkield and, in 1912, he became head of the new Department of Zoology, a position he held until his death in 1941. Not long after beginning his appointment at Howard, Just was introduced to
Frank R. Lillie, the head of the Department of Zoology at the University of Chicago. Lillie, who was also director of the
Marine Biological Laboratory (MBL) at
Woods Hole, Massachusetts, invited Just to spend the summer of 1909 as his research assistant at the MBL. During this time and later, Just's experiments focused mainly on the eggs of marine
invertebrates. He investigated the fertilization reaction and the breeding habits of species such as
Platynereis megalops,
Nereis limbata, and
Arbacia punctulata. For the next 20 or so years, Just spent every summer but one at the MBL. While at the MBL, Just learned to handle marine invertebrate eggs and embryos with skill and understanding, and soon his expertise was in great demand by both junior and senior researchers alike. In 1915, Just took a leave of absence from Howard to enroll in an advanced academic program at the
University of Chicago. That same year, Just, who was gaining a national reputation as an outstanding young scientist, was the first recipient of the
NAACP's
Spingarn Medal, which he received on February 12, 1915. The medal recognized his scientific achievements and his "foremost service to his race." He had explored other areas including: experimental
parthenogenesis,
cell division, cell hydration and dehydration, UV carcinogenic radiation on cells, and physiology of development. In 1929, Just traveled to
Naples, Italy, where he conducted experiments at the prestigious
zoological station "Anton Dohrn". Then, in 1930, he became the first American to be invited to the
Kaiser Wilhelm Institute in
Berlin-Dahlem, Germany, where several
Nobel Prize winners carried out research. Altogether from his first trip in 1929 to his last in 1938, Just made ten or more visits to Europe to pursue research. Scientists treated him like a celebrity and encouraged him to extend his theory on the
ectoplasm to other species. He discovered what is known as the fast block to
polyspermy; he further elucidated the slow block, which had been discovered by Fol in the 1870s; and he showed that the adhesive properties of the cells of the early embryo are surface phenomena exquisitely dependent on developmental stage. He believed that the conditions used for experiments in the laboratory should closely match those in nature; in this sense, he can be considered to have been an early ecological developmental biologist. His work on experimental parthenogenesis informed
Johannes Holtfreter's concept of "autoinduction" which, in turn, has broadly influenced modern evolutionary and developmental biology. His investigation of the movement of water into and out of living egg cells (all the while maintaining their full developmental potential) gave insights into internal cellular structure that is now being more fully elucidated using powerful biophysical tools and computational methods. These experiments anticipated the non-invasive imaging of live cells that is being developed today. Although Just's experimental work showed an important role for the
cell surface and the layer below it, the "
ectoplasm," in development, it was largely and unfortunately ignored. This was true even with respect to scientists who emphasized the cell surface in their work. It was especially true of the Americans; with the Europeans, he fared somewhat better. == Personal life ==