cancer
Greg has lost close friends due to cancer. His support of cancer-related causes has taken different forms, including: raising funds for college scholarships in honor of a friend affected by cancer, speaking at events for people who work or volunteer in medical settings (e.g. a hospital in the US, a center for cancer patients in Canada) and writing articles for print and online publications (e.g. a profile on a cancer survivor - & - a profile on the founder of an organization that raises funds for rare cancer research). In one instance, Greg's efforts to support a friend who survived cancer were featured in a book she wrote about her own journey.