Original Authors:
Davy Temperley: http://theory.esm.rochester.edu/temperley/
Daniel Sleator: http://www.cs.cmu.edu/~sleator/
John Lafferty: http://www.cs.cmu.edu/~lafferty/

Much additional work has been done by many different developers.
The current lead developer is 
Linas Vepstas: http://linas.org/