He was a many-sided man, whose numerous works on many subjects had a great vogue in their day, but are now largely forgotten.

as an initiateur plutôt qu'un créateur (an initiator rather than a creator), chiefly because he introduced the philosophy of Descartes to Lausanne in opposition to the reigning Aristotelianism, and also as a Calvinist pedant (for he was a pastor) of the French abbés of the 18th century.

He was rector of the academy four times before 1724, when theological disputes led him to accept a chair of philosophy and mathematics at Gröningen.

In 1726 he was appointed governor to the young prince Frederick of Hesse-Kassel (or Hesse-Cassel), and in 1735 returned to Lausanne with a good pension.

[1] Edward Gibbon, describing his first stay at Lausanne (1752–1755), writes in his autobiography, "The logic of de Crousaz had prepared me to engage with his master Locke and his antagonist Bayle".