Massenat attended Trenton Catholic Academy high school in Hamilton, New Jersey.

In his freshman season at Drexel University, Massenat started every game for the Dragons at point guard, and was named to the Colonial Athletic Association (CAA) All-Rookie Team.

The following season, Massenat led the CAA in three point percentage (.450), assists per game (4.8), and assist/turnover ratio (2.2).

In this senior year, Massenat received first-team honors for the second time after leading the conference in assists (4.8 apg) and ranking seventh in scoring (17.4 ppg).

On July 6, 2014, the Washington Wizards announced that Frantz Massenat was added to their 2014 NBA Las Vegas Summer League roster.

[11] On July 21, 2020, he has signed with Victoria Libertas Pesaro of the Italian Lega Basket Serie A (LBA).

[15] Massenat, who is of Haitian origin (his parents were born there),[16] was a member of Haiti's men's national team.