1927 – Born in New York City on the 19th of September.
1949 – He graduated from the Bronx High School of Science; Brown took three degrees at Columbia University, including, at age 21, a Ph.D. in physics.
1952 he joined the staff of the Lawrence Radiation Laboratory at Livermore, California,
1950 – He served as a member of or consultant to several federal scientific bodies and as senior science adviser.
1961-1965 – Brown worked under Robert McNamara as director of defense research and engineering.
1969 – Secretary of the Air Force from October to February.
1977 – He was president of the California Institute of Technology.
1978 – In May the NATO heads of government endorsed a Long Term Defense Program that included 10 priority categories: enhanced readiness; rapid reinforcement; stronger European reserve forces; improvements in maritime capabilities; integrated air defenses; effective command, control, and communications; electronic warfare; rationalized procedures for armaments collaboration; logistics co-ordination and increased war reserves; and theater nuclear modernization.
1979 – Brown and his staff had developed a "countervailing strategy", an approach to nuclear targeting that both McNamara and Schlesinger earlier had found attractive but never formally codified.
1981 – Brown left office on the 20th of January following President Carter’s unsuccessful bid for re-election.
– Received the Presidential Medal of Freedom.
2006 – On the 5th of January, he participated in a meeting at the White House of former Secretaries of Defense and State to discuss United States foreign policy with Bush administration officials.