He played an important role in the book The Kings of New York, written by Michael Weinreb and published by Gotham Press in 2007.

Lenderman was first in the 2008 USCF Grand Prix, scoring higher than all the grandmasters he competed against by playing and championing in smaller events, including WCL tournaments.

Lenderman earned three Grandmaster norms in quick succession in the summer of 2009: In 2014 he won the 18th Open International Bavarian Chess Championship in Bad Wiessee on tiebreak over Robert Hovhannisyan and Ante Saric, after they all tied for first with a score of 7.5/9 points.

[7] He won the 2015 World Open after beating Rauf Mamedov in an armageddon playoff; the two had the best tiebreak among eight players who tied for first place with 7/9.

Later in the same month, Lenderman played in the Chess.com Isle of Man Open, where he finished with a record of +3-0=6, which included a win against Francisco Vallejo Pons, and a performance rating of 2768.