The son of a clergyman, Alexander Gerard studied at the grammar school at Aberdeen and attended Marischal College (M.A. 1744) where he taught moral philosophy and logic from 1750, and divinity from 1760. In 1771 Gerard moved to King's College Aberdeen, where he was professor of divinity. James Beattie was Gerard's student, and succeeded him as professor of moral philosophy at Marischal.
Plan of education in the Marischal College. 1755.
An essay on taste. 1759, 1780.
A thanksgiving sermon. 1759.
A sermon on Titus 1:7. 1760.
The influence of piety on the public good. A sermon. 1761.
Influence of the pastoral office. 1761.
Dissertations on subjects relating to the genius and the evidences of Christianity. 1766.
An essay on genius. 1767, 1774.
Influence of piety on the public good; on Deut. 6:24. 1776.
Liberty the cloke of maliciousness, both in the American rebellion, and in the manner of the times; a sermon. 1778.
Sermons. 2 vols, 1780, 1782.
The pastoral care. 1799.
A compendious view of the evidences of natural and revealed religion [continued by G. Gerard]. 1828.