Erastus Williams was born in Lebanon, Connecticut, on the 7th day of February, 1773, and after studying medicine was examined and received his license under the authority of the Vermont Medical Society on the 9th day of July, 1800. He began his professional career in the town of Berne (now Knox) in Albany county, and became a member of the Medical Society in 1812. Dr. Williams was a man of versatile talents, and they were employed for the general good of the community in which his lot was cast. He was six feet in height, with an erect form, and elastic military carriage; his complexion was light, his hair auburn, his manners gentlemanly, his nature genial and social, and his judgment sound. He enjoyed for many years an extensive country practice. As a Christian he was active and useful, being for a number of years a ruling elderin the Tresbyterian church, and on three different occasions was commissioned to represent the presbytery of Albany in the general assembly. The last time he was a member of that body was just previous to its division in 1838.
Dr. Williams was elected from his assembly district, and served as a representative in the legislature of 1831. He was also greatly interested in military affairs, and ranking as major he served as brigade inspector for several years. His habits were industrious and active. After retiring from the practice of his profession he was always employed, serving as counselor to his friends, and as an executor of estates. He suffered from apoplexy, and having lain in an unconscious state for five days, he died on the 2d of June 1842, at the age of sixty-nine years. Dr. Williams had no sons, and but one daughter, now the wife of the Rev. David Lyon of Mariaville, Scoharie county.