Dirk Pitt, Jr. is a fictional character. He is a protagonist in a few recent Clive Cussler novels.born- 1981 (30 as of Arctic Drift)Dirk Pitt, Jr. is the son of Dirk Pitt and Summer Moran. He has a twin sister Summer Pitt. He works for the National Underwater and Marine Agency (NUMA) as the special projects director. He replaced his father at this post after his father took command of NUMA.