Martynchik has Belarusian and German roots. She studied philology at Odesa State University, but dropped out without graduating. From 1986 she collaborated with artist Igor Steopin, whom she later married. The couple moved to Moscow, Russia, in 1993, to work at Marat Gelman's gallery. There, Svetlana started writing fantasy books.
The pen name, Max Frei, was invented by Martynchik and Steopin for their works on comic fantasy series Labyrinths of Echo ("Лабиринты Eхо"). The plot follows the eponymous narrator, sir Max, as he leaves our "real" world for the phantasmagoric fantasy city of Echo. There, he becomes a member of a special service that controls the use of magic. The books are written by Martynchik, while Steopin developed the Echo universe and illustrated the books. Along with her Echo books, Frei also participated in several literary projects. She compiled Fram, a series of short story anthologies by Amphora publishing house. From 2006 to 2011, the series of books Russian Foreign Folktales ("Русские инородные сказки") was published as part of the Fram project.
The couple moved from Moscow to Vilnius, Lithuania, in 2004, out of their dislike of megalopolises.[4] There, Max Frei wrote four parts of magic realistTales of the Old Vilnius ("Сказки старого Вильнюса").