High Flyin' Ryan comes from the 2003-2004 era of Super Mario World hacking. He has released one finished hack: Super Mario World: High Flyin' Remix and has never finished: High Flyin' Remix 2: The Mushroom Kingdom.
As of March 2009, a new hack is under way.
In May 2010, High Flyin' Ryan released a new map series for the game Doom 2 running on the ZDoom engine. More info can be found here: http://www.doomworld.com/idgames/?id=16074