Geert Langelaar was born in Munich in 1962 and was raised in Graz, Stockholm and The Hague.
From 1981 to 1985 he studied violin with W. Libermann in Utrecht, before moving to Vienna to study with Günter Pichler.
He has often been engaged as a substitute at the State Opera and for the Vienna Philharmonic.
He first played with the ORF Vienna Radio Symphony Orchestra in 1987, standing in for a colleague on maternity leave, and was subsequently given a permanent position in the first violin section.
He has been married to Catharina Stenström Langelaar, also a member of the Vienna RSO, since 1991.