I am a master's student in Applied Math with two undergraduate degrees in physics and math. There is a professor who is coming to my university to give a talk on his research, and I read his abstract for the presentation as well as part of his most recent publication and I really would like to work with him doing this over the summer. He is from a National Lab I have interned in before as an undergrad. There is almost no programs for graduate students at that lab and, since I am an international student, I am ineligible for the only one I found there. Is there any way for me to approach him to ask him for the possibility of working with him?
I have a pretty strong research background, and professors I work with at my university will be at the talk he is giving. I don't know if this could help me in any way.