Harper is the senior mobilizing director for Sojourners, a national, Christian-oriented organization which calls for action for social and racial justice. During her March 3 lecture in Emerson Suites, she said the imaginative task is difficult for some people because many lack the imagination to think of a world where race-based poverty is not a constant war.

At a presentation Tuesday in Clark Lounge, Norbert Nathanson talked about his life as a person with disabilities, which he wrote about in his book, “A Secretly Handicapped Man: A Memoir.” He also discussed how the system for treating and assisting people with disabilities in America is flawed.