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**Roland Speicher** (born 12 June 1960) is a German mathematician, known for his work on free probability theory. He is a professor at the Saarland University.

After winning the 1979 German national competition Jugend forscht in the field of mathematics and computer science,^{[1]} Speicher studied physics and mathematics at the Universities of Saarbrücken, Freiburg and Heidelberg. He received in 1989 his doctorate from Heidelberg University under the supervision of Wilhelm Freiherr von Waldenfels with thesis *Quantenstochastische Prozesse auf der Cuntz-Algebra* (Quantum Stochastic Processes on the Cuntz Algebra).^{[2]} From 2000 to 2010 Speicher was a professor at Queen's University in Kingston, Ontario. Since 2010 he is at the University of the Saarland.

His research deals with free probability (with application to random matrices, statistical mechanics and operator algebras) and their combinatorial aspects and with operator algebras.

In 2012, Speicher received the Jeffery–Williams Prize.^{[3]} He also received the Research Excellence Award of the President of Ontario. In 2014, he was an invited speaker with talk *Free Probability and Random Matrices*^{[4]} at the ICM in Seoul.

Speicher is married and has four children.

- with James A. Mingo:
*Free Probability and Random Matrices*. Fields Institute Monographs, Vol. 35, Springer Verlag, New York, 2017. - with Alexandru Nica:
*Lectures on the combinatorics of free probability*, London Mathematical Society Lecture Note Series 335, Cambridge University Press 2006 *Combinatorial theory of the free product with amalgamation and operator-valued free probability theory*, Memoirs AMS 1998

**^**"Mathematiker mit Pioniergeist – Stiftung Jugend forscht e. V."*jugend-forscht.de*.**^**Roland Speicher at the Mathematics Genealogy Project**^**"Roland Speicher to Receive CMS 2012 Jeffery-Williams Prize for Research Excellence".*Canadian Mathematical Society*. 27 March 2012.**^**Speicher, Roland (2014). "Free probability and random matrices". arXiv:1404.3393 [math.OA].

- https://rolandspeicher.com/ - personal blog about free probability
- "Prof. Dr. Roland Speicher".
*Universität des Saarlandes*. - "ICM2014 VideoSeries IL8.13:Roland Speicher on Aug20Wed".
*YouTube*. 20 August 2014. - "Roland Speicher (1.1) Distributions on Random Matrices and Their Limits, part 1.1".
*YouTube*. 29 June 2017. - "Roland Speicher (1.2) Distributions on Random Matrices and Their Limits, part 1.2".
*YouTube*. 29 June 2017.