I will perform a bris on a baby who is born of a Jewish parent, or adopted by a Jewish person with the intention of raising the child as a Jew. I have performed berit milah for "traditional" two-parent families, interfaith couples, single parents, gay and lesbian parents, multicultural families, and any other combination you can think of. Sometimes the only thing my families have in common is that they are going to raise their son as a Jew.
Because I live on Long Island and am licensed to practice medicine in New York State, I can only perform a bris in New York. Families from other areas who wanted me as their mohel have held the bris in a hotel room or at a friend's or relative's house in the NYC/Long Island/Westchester area so that I could perform the ceremony.