Professor Hans Petter Langtangen, a member of our Academy, and a past Officer of the Computational and Information Sciences Division, passed away on October 10th at the age of 54.
Hans Petter was an extraordinary researcher, lecturer, and supervisor. He has authored many fantastic books on software and methods for numerically solving differential equations that have become very popular and have influenced the field of computational science and engineering considerably. Hans Petter was always open, generous, full of energy and passion, continuously spreading ideas and inspiration around him. He will continue to be remembered by many people for years to come.