Dong Nguyen, is a Vietnam-based developer and programmer who is best known for creating the popular mobile game called Flappy Bird, which eventually rooted to countless more games after its deletion in 2014. He works for the company, .GEARS (dotGears) studios, which specializes in creating simple retro pixelated games rather than the more complex ones seen today.
Flappy Bird was said to be developed in around two to three days, the character taken from one of Nguyen's cancelled projects back in 2012. He has a sister named Ding.
Source: Flappy Bird Wiki