Stefan Glänzer is a German entrepreneur and investor, specialising in technology based companies and internet start-ups. His newest venture is as founding partner of Passion Capital early-stage VC fund and co-founder of White Bear Yard  in London's east end, a 20.000 sqft co-working space for the European internet scene. He holds a PhD in foreign exchange risk management and describes himself as a firm believer in European entrepreneurship, on which he taught courses at the WHU business school.
Companies Glänzer has founded or co-founded include companions.de, Ricardo.de, myblog.de and Mendeley. His investments include Last.fm, Wahanda.com, Reality Jockey, Smarkets, Adzuna, Timetric, Tradeshift. and ERepublik. Many of the companies Glänzer has invested in have offices in a 20.000-square-foot (1.8581 m2) "incubator" space called White Bear Yard near Farringdon in London.
Last.fm is an Internet radio site for streaming music, founded in 2002. Using a recommend system called Audioscrobbler, Last.fm records user’s different musical taste and makes recommendations. The site also offers different social networking features, allowing users to share their tastes.
A professional DJ for 15 years, Glänzer first encountered the digital radio site through his German music blog. In 2004 he invested in the site and became chairman. In 2007, the media profile of the site increased and the number of users rose to 40 million. Glänzer received £22 million for his stake when the business was taken over by CBS Radio later that year.
Wahanda was a health, beauty and wellness site set up by Lopo Champalimaud and Salim Mitha in 2008. Wahanda connected consumers, wellness businesses and professionals through content (such as listings of spas, clinics and yoga centres), professional and user generated ratings and reviews, and through transactions, bookings and commerce. It was sold in 2015 to Recruit and rebranded as Treatwell.co.uk.
Glänzer invested in Wahanda in February 2008, shortly before the site launched, and was an active member of their board.
In November 2012 Glänzer admitted to sexually assaulting a woman on the London Underground after police witnessed the assault. He said he was on a "drugs binge" at the time of the incident and that his behaviour had never previously led to “anything like this.” He was due to be sentenced in December 2012 and will be listed on the Sex Offenders Register. 
- Kim-Mai Cutler (2009-12-18). "Running a startup in London? Check out White Bear Yard". VentureBeat. Retrieved 2010-09-10.
- "Stefan Glänzer - Personenprofil | Gründerszene". Gründerszene. Retrieved 2016-03-01.
- ricardo.ch. "ricardo - kaufen & verkaufen auf Ihrem Schweizer Online-Marktplatz" (in German). Ricardo.ch. Retrieved 2010-09-10.
- "Academic reference management software for researchers". Mendeley. Retrieved 2010-09-10.
- "Timetric closes seed funding for ‘statistics on speed’ platform". Techcrunch.
- "Tradeshift signs new angels". Techcrunch.
- TechCrunch (2015-05-05). "Wahanda Exit". TechCrunch. Retrieved 2016-02-22.
- Butcher, Mike. "High Profile UK VC Stefan Glaenzer Faces Jail After Sexual Assault Conviction". TechCrunch. Retrieved 2012-11-30.
- News, BBC. "Stefan Glaenzer admits sex assault on London Underground". BBC. Retrieved 2012-11-30.