Rolf Kemler, Emeritus Director at the Max Planck Institute of Immunobiology and Epigenetics, has been awarded the 2020 Canada Gairdner International Award together with Masatoshi Takeichi from the Japanese Riken Center. The two biologists are honored for their research on cell adhesion mechanisms. Their contributions were central to the understanding of cell-cell adhesion as well as cell communication. The molecules and mechanisms discovered also play an important role in cancer research since misregulation is involved in the development of different forms of cancer. The prize by the Gairdner Foundation is Canada’s most prestigious science award and recognizes world-renowned researchers for their groundbreaking work of great importance to medicine and human health.