[3] Seidel was one of the group of now famous players from the former Mayfair Club in New York City, including Stu Ungar, Jay Heimowitz, Mickey Appleman, Howard Lederer, Jason Lester, Steve Zolotow, Paul Magriel, and Dan Harrington.

[12] In January 2007, Seidel finished in second place in the Aussie Millions $100,000 event and took home $550,000(AUD), beaten by Erick Lindgren in Heads-Up play.

[14] In March 2010, Seidel finished in second place in the National Heads-Up Poker Championship and collected $250,000 after a 2–1 loss to Annie Duke in the final.

[15] In January 2011, Seidel finished in fourth place in the PokerStars Caribbean Adventure High Roller Event for $295,960, then went on later that month to take 3rd in a A$100,000 buy-in Aussie Millions tournament for $618,139.

[17] In March 2011, Seidel won the National Heads-Up Poker Championship, defeating 2003 World Champion Chris Moneymaker in the final.

[19] In August 2011, Seidel finished runner-up to David Rheem in the $20,000 buy-in 6-Max No Limit Hold'em tournament at the inaugural Epic Poker League for $604,330, which brought his earnings for 2011 to over $6.2 million.

Deuce to Seven Draw Lowball w/rebuys An "O" following a year denotes bracelet(s) won during the World Series of Poker Online Seidel is married and has two daughters, Elian and Jamesin.