Engineering and Design:

Brent Simmons
Sheila Simmons
Ranchero Software
info@ranchero.com
http://ranchero.com/

Application icon, toolbar icons:

Bryan Bell
http://www.bryanbell.com/

Credits:

For beta testing, feature requests, and other help, thanks go to:
Allen Hutchison, Andy Fragen, Brent Neal, Brian Pink, Chris Laprun, Cris 'atariboy' Pearson, Donovan Watts, Eric Albert, Faisal N. Jawdat, François Nonnenmacher, Frank Steele, Gabriel Radic, Greg Pierce, Jasmeet Singh, Jack Barse, Jack Foster Mancilla, James Huston, Jason Snell, John Gruber, Jonathan Greene, Kevin Ballard, Lucien W. Dupont, Marcus A. Hofmann, Mark Smith, Mike Cohen, Mike Harris, Mike Morper, Miraz Jordan, Nat Irons, Nicholas Riley, Noah Mittman, Paul W. Swansen, Philippe Martin, René Puls, Robert Occhialini, Ronan, Ryan Abrams, Samuel DeVore, Scott Loftesness, Scott P. Richert, Seth Dillingham, Steve Kirks, Sylvain Carle, Ted Leung, Tim Pritlove, Timothy Jarrett, and all the members of the MarsEdit beta list.