Some of my puzzles were used in the following U.S. and World Puzzle Championships.

1999 U. S. Puzzle Championship (3 puzzles)	2000 U. S. Puzzle Championship (13 puzzles)	2000 World Puzzle Championship (18 puzzles)
2001 U. S. Puzzle Championship (3 puzzles)	2002 U. S. Championship (5 puzzles)	2003 U. S. Puzzle Championship (3 puzzles)
2004 U. S. Championship (4 puzzles)	2005 U. S. Puzzle Championship (4 puzzles)	2006 U. S. Championship (5 puzzles)
2007 U. S. Puzzle Championship (1 puzzle)	2008 U. S. Championship (2 puzzles)	2009 U. S. Championship (3 puzzles)
2010 U. S. Championship (2 puzzles)	2011 U. S. Championship (1 puzzle)