The series was co-created by Hagai Levi and Sarah Treem. However, Levi retired from writing the series during the second season. His stated reason was that the show was moving away from what he had envisioned. Treem was therefore "the best person" to author the show from that point on.
At the onset of the series The Affair (2014) it is safe to assume that Ruth Wilson as Alison Bailey and Dominic West as Noah Solloway will be having an affair which will be the central plot of the story. In the series Luther (2010) Ruth Wilson as Alice Morgan plays the foil of D.I. John Luther portrayed by Idris Elba. Idris Elba was the key antagonist Russell "Stringer" Bell, who was pursued by Dominic West as 'Det. James 'Jimmy' McNulty' in the HBO series The Wire (2002).
The trivia item below may give away important plot points.
In Season 2, Maura Tierney's character had an affair with the character played by Josh Stamberg, who also played a character who had an affair with Lauren Graham's character on Parenthood. Lauren Graham replaced Maura Tierney on Parenthood after she left the show due to her breast cancer diagnosis.