A leading figure in physics, Andrew Lange  of the California Institute of Technology, killed himself last week, leaving many of his colleagues deeply saddened and confused. Last year, Lange won the prestigious Dan David Prize,  worth $1 million, in astrophysics. While unrelated to Lange's death, concerns about suicide have been prominent at Caltech of late because of three student suicides  in the last year. Following those deaths, the institute created a task force on mental health issues and has brought in extra counselors as needed. An outside consultant is also studying options for helping students who may face mental health difficulties. The campus counseling center was open over the weekend, following Lange's death.