Maybe more than anyone in North America in the last 20 years, Brian Sullivan has been deeply involved in things that birders do. He was one of the original developers of eBird, which hardly needs an introduction to listeners, and is now project lead of Cornell’s Birds of the World. In the last couple years Birds of the World has absolutely become an essential collection of bird knowledge which is all the more amazing considering the scope of the project.
Also, Merlin's Sound ID is better than you think.