When researching someone, the first step should always be www.imdb.com. Imdb pro is the paid version of the site that offers extra information about projects and people. That can be key. If you are serious about the industry, try out a free month membership on it. But also be aware that credits don't always correspond to role and place in the industry. Some critical people on projects often get no credit or a simple thank you buried in end roll. But www.imdb.com is an excellent place to start. And the site also solves 98% of all arguments as to who directed what and who was in that movie.