Langerman left his Belgian secondary school at age 13 and was admitted by examination to the École polytechnique of the Université libre de Bruxelles. He studied civil engineering there for two years before switching his course of study to computer science, and earning a licenciate.
After working as a user interface programmer for the Center for Digital Molecular Biophysics in Gembloux,
he moved to the US for graduate study at Rutgers University, where he earned a master's degree and then in 2001 a PhD. His doctoral dissertation, Algorithms and Data Structures in Computational Geometry, was supervised by William Steiger.
Next, before joining ULB and FNRS, Langerman worked as a postdoctoral researcher at McGill University with computational geometry researchers Luc Devroye and Godfried Toussaint.
Langerman is also the founder of Langerman SPRL, a Belgian colored-diamond company based on the collection of Langerman's father Arthur Langerman [fr], a dealer of colored diamonds who is also noted as an author and as a collector of anti-semitic posters.
He is the co-author with his father of a paper on Morpion solitaire, written jointly with another father-and-son pair, Martin Demaine and Erik Demaine.[MS] Both Stefan Langerman and his father are members of the Board of Trustees of the Arthur Langerman Foundation, a non-profit organization based in Berlin, which makes its founder’s unique collection of visual antisemitica available for research, educational and exhibition purposes.
Aloupis, G.; Cardinal, J.; Collette, S.; Iacono, J.; Langerman, S. (2006), "Where to build a temple, and where to dig to find one", Proceedings of the 22nd European Workshop on Computational Geometry (EuroCG06)