Soll is an adoptee, psychotherapist specializing in abuse- and adoption-related issues, director of the Council for Equal Rights in Adoption and of Adoption Crossroads (an organization for assisting the tracing and reunification of adoptees and birth families and supporting all people affected by adoption). He is a frequent guest on radio and television programs about adoption, an expert court witness and professional lecturer.
He has been a college teacher at Fordham University and wrote Adoption Healing: A Path to Recovery (2000).
He was bought by his parents on the black market from the Bessie Bernard operation in Brooklyn, and has been unable to trace his birth mother.