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Louis Nirenberg passed away in New York City on January 26, 2020 at the age of 94.

He was a leading mathematician, whose fundamental contributions in the field of partial differential equations were hugely influential. This area of mathematics provides the language we use to describe—and the techniques we use to analyze—diverse problems from many fields, including geometry, physics, and engineering. Over the course of Louis' long and productive career his achievements included the solution of many important problems, and—equally significant—the introduction of many new ideas and techniques.

Lively and gregarious, Louis loved music, art, and film almost as much as he loved mathematics. He maintained close friendships with many colleagues around the world. He loved to travel, and to host visitors. He particularly enjoyed working with others; as a result, almost all his papers were coauthored. A gifted teacher and mentor, he had a formative influence on many students, postdocs and collaborators.

Additional information about Louis is available from many online sources, including:

Our memorial event for Louis will be nearly 3 years after his death. We would have liked to do it earlier, but the pandemic made that impractical. Fortunately, it is now possible. Surely it is still timely.