He was educated at Christ"s College, Cambridge, where he graduated Bachelor of Arts in 1622. He was incorporated Bachelor of Arts at Oxford on 24 February 1625, graduated Master of Arts
At Lincoln College on 28 March 1625, and was incorporated Master of Arts at Cambridge the same year. In 1627 Viccars became vicar of Street Mary"s Church, Stamford. But in 1628 some of the congregation accused him of heresy.
Brought before the Court of High Commission in 1631, he was defrocked, fined and imprisoned.
In 1635 he recanted, and re-entered the ministry. He went abroad, on scholarly travels.
In 1640 Viccars was presented to the rectory of South Fambridge in Essex. He held it until 1646, when he was sequestered by the Westminster Assembly of divines.
Viccars is mentioned in connection with Brian Walton"s London Polyglot in 1652, but not subsequently.
He may therefore have died around 1653.