A seven-year veteran of Apple, Dave DeLong is an accomplished iOS engineer with a passion for teaching, experimentation, and hacking the Objective-C runtime. During his time at Apple, he worked on the UIKit framework, Developer Evangelism, and Apple Maps. He now works as a Principal iOS Engineer at WeWork. Dave, his family, and his large collection of Brandon Sanderson books live near Salt Lake City, where he’s an active member of the local developer community. He can often be found on Twitter teaching developers about all the ways that calendrical calculations can go wrong and pontificating on the virtues of eating chocolate with peanut butter.