Ján Šubjak was born in a small city in northern Slovakia, where he lived until the age of 17. He then moved to the capital city to attend Comenius University, where he earned his BSc in physics and later his MSc in astrophysics, focusing on photometric observations of exoplanets.

During his master's studies, Ján developed a strong passion for astronomy. After graduating, he decided to move to the Czech Republic to pursue his academic goals further. He began his PhD studies at Charles University and joined the Ondrejov Exoplanet Group at the Astronomical Institute of the Czech Academy of Sciences. His research focused on the spectroscopic and photometric characterization of substellar companions to stars. He participated in several international collaborations and spent part of his studies at the Instituto de Astrofísica de Canarias in the Canary Islands and the European Southern Observatory in Germany. Ján completed his PhD in September 2022, and his doctoral thesis was awarded the Jan Frič Prize.

In 2023, he started a postdoctoral fellowship at the Center for Astrophysics | Harvard & Smithsonian, working on the LASTORIA project under the Czech Science Foundation. After spending two years in Boston, he returned to the Czech Republic this year, where he is finishing the LASTORIA project as an external collaborator with the Center for Astrophysics.

In his free time, Ján enjoys hiking with friends, traveling, playing football and beach volleyball, practicing photography, drawing, writing, and playing chess. He is also active on Instagram, where he popularizes astrophysics for thousands of Slovak and Czech audiences (@johnnysubjak).