Well of course the first to be mentioned has to be Jason Fung. He and Jimmy Moore have a new book out which is a corker.
Jimmy and Jason also have a new podcast called Fasting Talk
https://itunes.apple.com/us/podcast/fasting-talk/id1192105323
Jason has his own blog which discusses all the health issues around the patients he treats but includes plenty on fasting.
https://intensivedietarymanagement.com
Michael Mosely is popular on UK tv and now travels and speaks internationally. His main focus has always been the 5:2 diet which he now combines with the Mediterranean diet in his new book The Fast Diet.
https://www.youtube.com/watch?v=VWtaLLjJzn4
Valter Longo talks about fasting in relation to ageing and disease.
https://www.youtube.com/watch?v=d6PyyatqJSE
Who inspires you?