Lizz Mueller, left, has been friends with Ari Harms for about 7 years. Harms has been missing since Sunday, when he entered the fast-moving Colorado River in a kayak in Grand County. (Provided by Lizz Mueller) As the search continues for an Edgewater man who has not been seen since entering the fast-moving Colorado River in a kayak on Sunday, colleagues and friends in Denver recall him as a tireless champion of people in need. Ari Harms, who has a master’s degree in international human rights from the University of Denver Josef Korbel School of International Studies, has worked for several Denver nonprofits where he helped people secure housing and other resources. “Ari has that sense of passion for the underserved and those without a voice in the community,” said Ron Buzzard, managing director of the ECDC African Community Center of Denver.