How can I exhibit art (paintings) in NYC?

Or rather, how can my friend garner some interest in exhibiting her husband’s paintings?

A little back story:
She is here from Spain for two weeks. In that time she wants to make some contacts and visit some galleries to see if it is possible to exhibit her husband’s work in New York City. Hubby and his artwork are in Spain, but she has a stack of information cards for his paintings. It would be important for him to show a collection in New York.

Any idea on how to accomplish this? I’d also be interesting in hearing ideas about unconventional places to show artwork.

Thanks in advance!