In the latter city he held the chair in theology for twenty years with great success and repute.
He was averse to the scholastic method and therefore had serious trouble with the authorities of the Order, which was finally smoothed over by Angelo Maria Cardinal Quirini and Pope Benedict XIV.
His published works fill several volumes, and have been prized for a combination of theological and historical erudition.
His most important works are: His controversy with Francesco Maria Zanotti in defense of Maupertuis's apology (Berlin, 1749) for Christian morality, as superior to that of the Stoics, was celebrated in the eighteenth century.
His brother, also a Dominican, Carlo Agostino Ansaldi, wrote a work (Turin, 1765) on the large number of the Christians before Constantine I; another brother, Pietro Tommasso Ansaldi, wrote a dissertation on the divinity of Christ (Florence, 1754).