We miss Dr. Mihaly Csikszentmihalyi, one of the founders of positive psychology and a frequent professor and speaker to the MAPP program.  Here is a link to his obituary at the University of Chicago.  Other obituaries are behind the paywalls of papers like the New York Times and Washington Post.  An obituary of him was also published in the January 29 2022 issue of the Journal of Happiness Studies.

Orin Davis, one of his PhD students, wrote a tribute to him on Positive Psychology News:  Shoot the Canon from a Cannon