John Keith Stuart McKay: 1939 - 2022

We give an overview of several of the mathematical works of Gilles Lachaud and provide a historical context. This is interspersed with some personal anecdotes highlighting many facets of his personality.

This is a short obituary of Saunders Mac Lane (1909--2005).

This article is a reflection on the mathematical legacy of Professor Petr Simon.

The article is dedicated to thye memory of a distinguished mathematician Professor Misha Shubin

This brief text is in memory of Professor Ivan Kupka. It presents his vision, scientific life, his interest in mathematics and our join collaboration.

Cem Tezer was a fastidious, meticulous, highly idiosyncratic and versatile scientist. Without him Turkish community of mathematics would be incomplete. Our sense of gratitude for his work in various areas of mathematics, history of sciences, literature, music and his encouragement to do mathematics for only its beauty was hardly unique and even unusual. After he passed away on 27 February 2020, while working actively at Middle East Technical University, the number of colleagu...

An overview on Masaki Kashiwara's mathematical work since 1970

Hans Grauert died in September of 2011. This article reviews his life in mathematics and recalls some detail his major accomplishments.

In remembrance of Professor Uffe Valentin Haagerup (1949--2015), as a brilliant mathematician, we review some aspects of his life, and his outstanding mathematical accomplishments.

The Midwest Geometry Conference 2007 was devoted to the substantial mathematical legacy of Thomas P. Branson who passed away unexpectedly the previous year. This contribution to the Proceedings briefly introduces this legacy. We also take the opportunity of recording his bibliography. Thomas Branson was on the Editorial Board of SIGMA and we are pleased that SIGMA is able to publish the Proceedings.