[1] Playing for gold medal-winning Team USA, Weisz was the Most Valuable Player of the Under-18 basketball competition in the 2013 Maccabiah Games.

[6][7] Playing for Princeton University, Weisz earned the 2014 Ivy League Men's Basketball Rookie of the Year.

[8] On December 7, 2013, he posted his first career double-double with 17 points (including 3-for-3 on three-point field goals) and 10 rebounds against Fairleigh Dickinson.

[21] Weisz was included on the National Association of Basketball Coaches Division I All‐District 13 second-team, earned honorable mention on the Associated Press All-America team, and was named to the Jewish Sports Review 2016–17 Men's College Basketball All-American First Team.

[13] On August 3, 2017, Weisz started his professional career with Hapoel Gilboa Galil of the Israeli Basketball Premier League, signing a one-year deal with an option for another one.

[26] Weisz helped Gilboa Galil reach the 2018 Israeli League Playoffs, where they eventually lost to Hapoel Jerusalem in the Quarterfinals.

[27] On April 10, 2019, Weisz recorded a career-high 27 points, shooting 6-of-9 from three-point range, along with eight rebounds, six assists and three steals, leading Ashdod to a 94–86 win over his former team Hapoel Gilboa Galil.

[4][34] In the final, gold medal game against Team Israel, Weisz scored 19 points, brought down 12 rebounds, and had 11 assists.