Do we need to do an adoption in both U.S. and Poland?

My wife and I very much want a child and have been unable to have any. We are both Polish and have decided to adopt a child from an orphanage in Poland. We need to understand the U.S. laws and the Polish laws relating to this adoption. First, do we need to do an adoption in both the United States and in Poland? Second, how do we obtain the services of an attorney who is experienced in both U.S and Polish law? We want to make sure that we are fulfilling all the necessary requirements and that the adoption goes through as quickly as possible.