Ariel Waldman is the founder of Spacehack.org, a directory of ways to participate in space exploration. She also organises Science Hack Day San Francisco, an event that brings together scientists, technologists, designers and people with good ideas to see what they can create in one weekend.
Spotting a theme here? Ariel is mad about science and does everything she can to make it more accessible to everyone. Take a look at her keynote on Hacking Space Exploration at OSCON last year.