Columbia University from 1929 to 1936. Following the survey he conducted for the New York State Board of Regents from 1937 to 1939, he worked as research psychologist for the United States Housing Authority and the Office of Strategic Services from 1940 to 1943. He was also a visiting professor of psychology at Howard University in Washington, D.C. from 1941 to 1943. He then worked as director of research and publications of the American Jewish Committee from 1943 to 1946, senior psychologist of the Department of Defense from 1947 to 1949, and an associate director of a health survey for the New York Academy of Medicine from 1950 to 1951. He was also chairman of the American Sociometric Association committee on research from 1948 to 1950, a member of the American Sociological Society committee on housing research from 1943 to 1945, the National Jewish Welfare Board committee on war records from 1946 to 1948, the Boy Scouts of America advisory committee on program research from 1929 to 1940, and the New York State Board of Regents advisory committee on character education from 1939 to 1941, a delegate to the Tenth International Congress of Psychology in Copenhagen in 1932 and the Eleventh International Congress of Psychology in Paris in 1937, and a fellow of the American Psychological Association, the American Association for the Advancement of Science, and the New York Academy of Medicine. In 1949, Maller was named head of a new psycho-educational clinic that specialized in adjustment problems of gifted children and refugee families at Yeshiva University's School of Education and Community Administration. In 1954, he was director of research for a fact-finding committee for the New York City Board of Education to examine the application of the state formula for allocating aid to education to New York City. The committee concluded the city wasn't getting as much state aid as it should have been. By 1955, he was senior management consultant for New York City Administrator Dr. Luther Gulick. He resigned from the position that year when New York State Comptroller Arthur Levitt Sr. appointed him Director of Research and Statistics in the Department of Audit and Control. He still held that position when he died. He was also professor of psychology at Yeshiva University from 1949 until his death. Maller developed the "Guess Who" technique in 1929, a sociometric test for children. He also devised the personality test