Lacy lost one of his hands as an adolescent and, as a result, spent his time studying the classical languages.
In 1781 was offered the position of tutor at Hampden–Sydney College, which he accepted, serving in that capacity for some time; he studied theology under the preceptorship of Dr. John Blair Smith, president of Hampden–Sydney, was licensed to preach in September, 1787, and ordained in October, 1788, in which year he was elected vice president of the college.
Congressman James Jones, Kentucky Governor and Secretary of Treasury George M. Bibb, and University of Georgia President Moses Waddel.
[5] During the remainder of his life he devoted his time and attention to supplying neighboring churches and also taught a classical school.
Lacy also served as moderator of the general assembly of the Presbyterian Church in 1809, and as clerk of the Hanover Presbytery during the greater part of his ministry.