Gellért is a student of Jászberény Group 2. He is also a professional chess player, having achieved the title of Fide International Master at the age of 19, and is steadily working towards the Grandmaster title. He has participated and succeeded in numerous international tournaments.

He is also the leader of the Csányi Foundation Chess Team, with whom they achieved an outstanding ranking in the World Student Chess Tournament Online, organized by the Spanish Pavilion of the Dubai World Expo 2021.

He represented our country at the 2022 European U18 Championship in Antalya and finished 50th out of 400 participants in a very strong international field at the 2023 Reykjavik Open.