Kampelman was a member of the Board of Advisors for the think-tank Jewish Institute for National Security Affairs (JINSA).

From 1958 to 1985 he served on the board of trustees of the Institute for American Universities, a non-profit study abroad organization for U.S. undergraduates in Aix-en-Provence, France.

In May and June 1990, Ambassador Kampelman returned to the negotiation table of the CSCE for the successful Copenhagen Declaration.

[7] He was personally commended by President George H. W. Bush for his delegation's "major role in that historic achievement".

[8] Kampelman served as a motivating force behind the op-ed "A World Free of Nuclear Weapons", published on January 4, 2007, in The Wall Street Journal by George P. Shultz, Henry Kissinger, Sam Nunn and William Perry.

Kampelman received thirteen honorary Doctorate degrees, as well as the Knight Commander's Cross of the Order of Merit of the Federal Republic of Germany.