[3] In 1864 he was purchased by Robert A. Alexander, owner of the famous Woodburn Stud near Midway, Kentucky.
Taught the breeding and training of horses, after he was freed Williamson remained in Alexander's employ.
Williamson was the trainer for Merrill, ridden by Abe Hawkins when he won the third Travers Stakes in 1866.
In addition, Williamson trained horses who won other major races such as the Jerome Handicap and the Withers Stakes.
In 1998 Ansel Williamson was inducted posthumously into the National Museum of Racing and Hall of Fame.