He is a friend of Jamil and Farah, and can be found in South Estamir. He starts out in the party when playing as Jamil, but is difficult to recruit otherwise.
Recruitable from South Estamir, inside the Slave Trader's House, but he cannot be re-recruited by Jamil and to unlock him for other characters, the player must play as Jamil and make him leave before finishing the Assasin's Guild quest. If a player does so, he becomes unlocked for all future playthroughs. However Dowd and Jamil have a special lock-out system in place where having one of the 2 in the party, forbids the other to appear. The one exception to this is playing as a female character and completing Wuhan's Secret, Jamil appears in Farah's house at the end, and his recruitment is possible there, even if you have Dowd, so if you recruit Dowd after that, and come back to the house, you can get both.