Melinda Seckington is a developer, blogger and event organizer. She is currently a developer at FutureLearn, a social learning platform offering free courses from top universities. Melinda is interested in interested in solving complex problems with artificial intelligence and machine learning algorithms.
MongoDB 3.0 was also released a few weeks ago and she'll talk a bit about what makes this version so monumental and why you should try it out.
For reference, here is an article announcing the release.
Emily Stolfo is a Ruby engineer on the drivers team. She also helps build the Ruby community by speaking at meetups, conferences and hacker schools. Emily also teaches Rails at Columbia University.