After studying in the University of Zaragoza, where he obtained a first degree, Gaspar Lax went to Paris where he took further degrees including a divinity degree taken at the Sorbonne.
Lax remained in Paris and taught there at the College de Calvi and then transferred to the Collège de Montaigu where he taught and studied under Maior.
In 1524 Lax left France and returned to Spain. He was appointed professor at the University of Zaragoza and remained there for the rest of his life. He did achieve certain higher posts within the University of Zaragoza, eventually becoming Vice Chancellor.
Lax published several good mathematics books based on works of Boethius, Euclid, Jordanus and Campanus. He was also known as a philosopher, often called the Prince of Sophists. Perhaps Maior's influence was one of the reasons he studied logical subtleties.
Lax also published Quaestiones phisicales in 1527.