Danica Kosanovic: The s-cobordism theorem and Siebenmann's thesis
Fabian Henneke: Introduction to L 2-Invariants
Gabriele Viaggi: Actions of surface groups on the circle
Federico Zerbini: Classical and elliptic multiple zeta values in Feynman integrals
Achim Krause: Periodicity in motivic homotopy theory over C
Links:
[1] https://www.mpim-bonn.mpg.de/taxonomy/term/39
[2] https://www.mpim-bonn.mpg.de/node/3444
[3] https://www.mpim-bonn.mpg.de/node/6282