Mohit Athwani is a self-taught iOS developer and has been developing apps since the early days of iOS 3. He has worked with several clients all around the world and has carried out intense research in the field of facial detection and recognition on iOS. His app, iRajanee, became the number one app on the Indian app store and fetched him tremendous success.
Mohit started his company, Geeks (http://www.geeksincorporated.net/), with a friend in 2010 and has since also involved himself in conducting training sessions on iOS for students and corporates alike. His website, http://indianios.guru/, hosts a lot of introductory videos and tutorials on developing for iOS with Swift.