Adlai E. Stevenson III, a scion of generations of Illinois Democrats, who shared the names and presidential ambitions of his father and great-grandfather but not their political successes, serving a decade in the Senate and losing two races for governor, died on Monday September 6 2021 at his home in Chicago. He was 90. Adlai Ewing Stevenson III was born in Chicago on Oct. 10, 1930, the oldest of three sons of Adlai Ewing Stevenson 2d and the former Ellen Borden. Adlai and his brothers, Borden and John, grew up in an intellectual home. Adlai III attended five grade and preparatory schools, including public schools in Lake Forest, Ill.; Harrow, in England, when his father worked there with a United Nations group; and Milton Academy, in Massachusetts, from which he graduated in 1948. After earning a bachelor’s degree in government from Harvard in 1952, Mr. Stevenson joined the Marine Corps. He married Nancy Anderson, who survives him, in 1955. In addition to her and their son Adlai, he is survived by another son, Warwick; two daughters, Lucy and Katherine; his brothers; and at least nine grandchildren. Mr. Stevenson graduated from Harvard Law School in 1957. After serving as a law clerk for an Illinois Supreme Court justice in 1958, he joined and later became a partner in a prestigious Chicago law firm, Mayer, Brown & Platt. After quitting active politics in 1986, he resumed practicing law, but in the 1990s he became president and chairman of SC&M Investment Management and later a co-founder of HuaMei Capital, both specializing in financial transactions between the United States and East Asia. (great-grandson of Vice President Adlai Ewing Stevenson), a Senator from Illinois; born in Chicago, Cook County, Ill., October 10, 1930; attended grammar schools in Illinois and Milton Academy, Massachusetts; graduated from Harvard College in 1952, and from the law department of the same university in 1957; entered United States Marine Corps as a private in 1952, served as a tank platoon commander in Korea, discharged as a first lieutenant in 1954 and from the Reserves in 1961 with the rank of captain; law clerk to justice of Illinois Supreme Court 1957-1958; admitted to the bar in 1957 and commenced practice in Chicago, Ill.; member, Illinois house of representatives 1965-1967; treasurer, State of Illinois 1967-1970; elected in a special election on November 3, 1970, as a Democrat to the United States Senate to fill the unexpired term caused by the death of United States Senator Everett M. Dirksen; reelected in 1974, and served from November 17, 1970, to January 3, 1981; was not a candidate for reelection in 1980; chairman, Select Committee on the Senate Committee System (Ninety-fourth Congress), Select Committee on Ethics (Ninety-fifth and Ninety-sixth Congresses); resumed the practice of law; unsuccessful Democratic candidate for governor of Illinois in 1982 and 1986; discontinued practice of law in 1992; founded and served as chairman of investment banking firm of SCM Investment Management 1992-; is a resident of Hanover, Ill.