Peter Francis James (Guiding Light, Oz) has been cast in The CW’s "Legends of Tomorrow" as Dr. Aldus Boardman, who will first appear in the show’s crossover episode with "Arrow".

Per ComicBook.com, Dr. Boardman — who is unique to the TV series — is a classics professor who has devoted his life to researching Hawkgirl, Hawkman and their link to Vandal Savage.

http://tvline.com/2015/09/24/oprah-winfrey-greenleaf-cast-own/