Santiago, Chile - W. Mark Felt managed to remain in history’s shadows for more than 30 years. It would seem that his energetic daughter Joan, the person most influential in persuading her father to make public his role as “Deep Throat,” also had a past in her past. Daughter Joan played a prominent role not only in “outing” her now-invalid 91-year-old father, but also in engineering book and movie deals. Long-estranged, father and daughter reconciled after he was widowed in the 1980s, and he has lived with her since. Following his Deep Throat revelation in June, Felt has been praised...