Page 297. " Not only did Drake determine that a radio search for alien messages had become possible, but he decided to do something about it "

The person that Grinspoon talks about here is an astronomer Frank Drake. I found his discovery of communicating with ‘aliens’ quite interesting and decided to research a bit about him. He is known to be the founder of SETI and the creator of two equations, one of them being the Drake equation; that are helpful for communication between Earth and the cosmos.