He contributed to the fields of operations research and applied discrete mathematics through the study of pseudo-Boolean functions and their connections to graph theory and data mining.
[1][2][3][4] Hammer was born in Timișoara, Romania,[1] into a Hungarian speaking Jewish family.
[5] He did both his undergraduate and graduate studies at the University of Bucharest, earning a diploma in 1958[1] and a doctorate in 1965 under the supervision of Grigore Moisil.
[1] In 1967, he and his wife (Anca Ivănescu) escaped Romania and defected to Israel.
They include: In 1966, as a recent doctorate, Hammer won the "Gheorghe Țițeica" prize of the Romanian Academy of Science.