Ferdinand Gotthold Max Eisenstein (16 April 1823 – 11 October 1852) was a German mathematician who made significant contributions to number theory and analysis.

Born in Berlin, Prussia, to Jewish parents who converted to Protestantism before his birth,[1] Eisenstein displayed exceptional mathematical talent from a young age.

His talent and zeal lead one to expect that some day he will make an important contribution to the development and expansion of science.

While still a student, Eisenstein began attending lectures by Peter Gustav Lejeune Dirichlet and others at the University of Berlin.

In 1843, he met William Rowan Hamilton in Dublin, who introduced him to Niels Henrik Abel's proof of the impossibility of solving fifth-degree polynomials, sparking his interest in mathematical research.