Rudolf Otto Sigismund Lipschitz (14 May 1832 – 7 October 1903) was a German mathematician who made contributions to mathematical analysis (where he gave his name to the Lipschitz continuity condition) and differential geometry, as well as number theory, algebras with involution and classical mechanics.

Despite having his studies delayed by illness, in 1853 Lipschitz graduated with a PhD in Berlin.

[2] After receiving his PhD, Lipschitz started teaching at local Gymnasiums.

In 1857 he married Ida Pascha, the daughter of one of the landowners with an estate near to his father's,[1] and earned his habilitation at the University of Bonn, where he remained as a privatdozent.

In 1862 Lipschitz became an extraordinary professor at the University of Breslau where he spent the following two years.