Thomas Friedrich was a German mathematian working in differential geometry and global analysis. He passed away in February 2018.
Thomas Friedrich contributed substantially to the development of Berlin mathematics, he was Editor-in-Chief of the journal Annals of Global Analysis and Geometry for more than three decades (and also one of the founding editors-in-chief), and in 2003 he received the Medal of Honor of the Charles University of Prague.
An obituary can be found on the webpage of the HU Berlin (link). There will be also a conference held in memory of Thomas Friedrich (link).