Full Name: Glenn Theodore Seaborg. Profession: American nuclear chemist, academic, university chancellor, Nobel Prize laureate in chemistry, and presidential science adviser. Nationality: American. Born: April 19, 1912. Birthplace: Ishpeming, Michigan, USA. Generation: Silent Generation (1928–1945 cohort). Chinese Zodiac: Water Rat (1912 is the Year of the Water Rat). Zodiac Sign: Aries. Age in 2026: Would have been 114 (deceased). Marital Status: Married to Helen L. Griggs in June 1942; their marriage lasted more than 56 years. Children: Six children — Peter (died 1997), Lynne, David, Steve, Eric, and Dianne. Cause of Death: Complications from a stroke suffered on August 24, 1998, while attending an American Chemical Society meeting in Boston; he died at his home in Lafayette, California, on February 25, 1999, aged 86. Description: Glenn Theodore Seaborg was one of the most consequential scientists of the twentieth century, a nuclear chemist who participated in the discovery and synthesis of ten transuranium elements—those heavier than uranium on the periodic table—including plutonium, americium, curium, berkelium, californium, einsteinium, fermium, mendelevium, nobelium, and seaborgium, the last of which was named in his honor, making him the first living person ever to have a chemical element named after him. Born in the iron-mining town of Ishpeming, Michigan, to a Swedish immigrant family, Seaborg moved to California at age 10 and went on to earn his Ph.D. in chemistry from UC Berkeley in 1937, joined the faculty there in 1939, and quickly established himself as one of the leading figures in nuclear chemistry. During World War II, he was recruited into the Manhattan Project at the University of Chicago's Metallurgical Laboratory, where, from 1942 to 1946, he led the crucial nuclear chemistry and physics research that isolated and produced the fissile plutonium-239 isotope used in the atomic bomb dropped on Nagasaki, Japan—a role that shaped the course of the war and left him an outspoken advocate of nuclear disarmament for the rest of his life. He was awarded the 1951 Nobel Prize in Chemistry, sharing it with physicist Edwin McMillan, for their discoveries in the chemistry of transuranium elements; at 39 years old at the time of the award, he delivered his Nobel banquet speech in Swedish, reflecting his family heritage, in a rare display of linguistic versatility among Nobel laureates. Beyond the laboratory, Seaborg served as Chancellor of UC Berkeley from 1958 to 1961, then as Chairman of the United States Atomic Energy Commission for a full decade under Presidents Kennedy, Johnson, and Nixon from 1961 to 1971, advising a total of ten American presidents on nuclear policy and science over his illustrious career, authoring more than 500 scientific papers, and reshaping the periodic table of elements through his actinide concept that reorganized how the heaviest elements are classified and understood.