Like his predecessor Henry A. Kissinger, Mr. Brzezinski was a foreign-born scholar (he in Poland, Mr. Kissinger in Germany) with considerable influence in global affairs, both before and long after his official tour of duty in the White House. He was one of the few foreign policy experts to warn against the invasion of Iraq in 2003. Zbigniew Kazimierz Brzezinski was born in Warsaw on March 28, 1928. His father, Tadeusz, was a diplomat who took the family along to France, then to Germany during the rise of Hitler in the 1930s and, fortuitously, to Canada on the eve of World War II. When the Russians took over Poland at the end of the war, Tadeusz Brzezinski chose to retire in Canada rather than return home. The younger Mr. Brzezinski graduated from McGill University in Montreal in 1949 and earned a master’s degree there in 1950. Then it was on to Harvard, which granted him a doctorate in political science in 1953 and appointed him as an instructor. He and Mr. Kissinger were among the candidates for a faculty position; when Mr. Kissinger won an associate professorship in 1959, Mr. Brzezinski decamped to Columbia University. His bond with Jimmy Carter developed through the Trilateral Commission, the group David Rockefeller created in 1973 as a forum for political and business leaders from North America, Western Europe and Japan to consider the challenges facing industrialized countries. Mr. Brzezinski was the commission’s first director. In 1974, Mr. Brzezinski invited Mr. Carter, then the governor of Georgia and a rising Democratic star, to become a member. Two years later, Mr. Carter was the Democratic nominee for president, and he hired Mr. Brzezinski as a foreign affairs adviser. Mr. Brzezinski, who had homes in Washington and Northeast Harbor, Me., was married to the Czech-American sculptor Emilie Benes, with whom he had two children in addition to Mika Brzezinski: Mark Brzezinski, a lawyer and former ambassador to Sweden under President Barack Obama, and Ian Brzezinski, whose career has included serving as a deputy assistant secretary of defense. All survive him. He is also survived by a brother, Lech, and five grandchildren.