Theirs was an arranged marriage: two well-educated children of prominent Pakistani families set up through a mutual friend. He was the quiet one; she was the one who laughed at parties. At their wedding in Peshawar six years ago, men and women danced separately but also together, “a rarity at that time,” recalled one guest. “It was such a huge gathering that even their family friends from Qatar came.” When they returned to the United States, his colleagues at the cosmetics maker Elizabeth Arden celebrated with a small office party.