His main career was as an explorer of remote regions, from which he brought back zoological and botanical specimens.
In 1932, he embarked on a series of ten expeditions to the jungles of British Guiana and Venezuela to collect zoological and botanical specimens.
In 1939, he returned to New York to work on Wall Street as a stockbroker and resumed his chess career.
[2] Pinkus won twice in the Manhattan Chess Club Championship (1941 and 1945)[3] and shared second in 1955.
[4] He played in several radio matches: US vs. USSR (1945),[5] New York vs. La Plata (1947), US vs. Yugoslavia (1950).