David Lawrence McCary is an American comedian, writer, and director. From 2013 to 2018, he served as a segment director for Saturday Night Live and was also the main director for the first two seasons of the popular web series Epic Rap Battles of History. During college he formed the sketch comedy group Good Neighbor. He is married to actress Emma Stone, with whom he has a daughter, and co-founded the production company Fruit Tree.

Epic Rap Battles of History (ERB) is a YouTube web series and music project created by Peter "Nice Peter" Shukoff and Lloyd "EpicLLOYD" Ahlquist. The series pits historical and pop culture figures against one another in a rap battle format. The characters portrayed are often determined by suggestions from viewers in the comments sections of the channel's videos. Shukoff and Ahlquist write each song themselves, researching the subject in order to find obscure details to use as references in the lyrics, although certain Patreon subscribers have also contributed to the writing process. Following an extended hiatus, the channel returned with a bonus battle in December 2018, and the sixth season debuted on April 20, 2019. As of February 23, 2023, the channel has 14.9 million subscribers and approximately 4 billion total video views.