He is best known as being the sire of the 1977 Triple Crown winner, Seattle Slew.
Bold Reasoning recorded his most important successes as a three-year-old in 1971, winning the Jersey Derby and the Withers Stakes.
He set a new track record at Belmont Park for six furlongs as a four-year-old in 1972.
Upon retirement, Bold Reasoning only produced three crops of foals at Claiborne Farm before his death on April 24, 1975, due to a breeding shed accident in which he cracked his pelvis.
[1] He sired Seattle Slew in his first crop of foals and the top-rated French two-year-old Super Concorde in his second.