As early as 1982, Ondřej Hájek made his debut as an eight-year-old pianist in Czech Television's programme entitled "The Family Play", performing his own composition for piano and double bass. At age 15, he was admitted to the Jaroslav Ježek Conservatory in Prague. In 1996 he graduated in piano under the guidance of prof. Jan Vrána and 2 years later he graduated in composition and arrangement at prof. Karel Růžička's class. During his studies, he co-founded several bands and performed in various, mainly jazz orchestras, with which he participated in numerous competitions, both Czech and foreign (e.g. first place at Swedish Östersund and first place at French Toulouse with the Mariánské Lázně Junior Big Band).
He started his professional career in 1996 in the Czech version of the musical Hair. In the same year, he won auditions for the Czech Radio Big Band headed by Felix Slováček, with whom he made numerous recordings for Czech Radio and Czech Television.
A year later, he became member of Karel Vlach's Orchestra and in 1999 he became the pianist of the Big Orchestra of the Žofín Palace. Since then, he has been accompanying virtually all prominent Czech singers – Karel Gott, Helena Vondráčková, Lucie Bílá, Jiří Korn, Hana Zagorová, Leona Machálková, Marie Rottrová, Eva Urbanová to name but a few.
He has also performed in concerts with many artist of such international renown as James Morrison, one of the world's top multi-instrumentalist, jazz trumpeter Benny Bailey, American megastar Shirley Bassey, Florian Silbereisen, DJ Otzi, Angela Wiedl and Helene Fischer.
He has performed not only in most European countries, but also for example in the USA, Canada, Russia, Vietnam and China.
Since 2003 he has been a member of the highly prestigious BoomBand orchestra, with which he accompanied Karel Gott and Helena Vondráčková at the world's most famous concert venue, New York's Carnegie Hall, in 2005.
He is highly valued as both a solo pianist, a studio musician and an accompanist. He performs as a guest in many pop, jazz and classical orchestras and, in addition, he devotes a portion of his time to teaching.
In 2009 he founded the ComfortMusic.cz agency, which represents a number of prominent Czech musicians that play entertaining, relaxed and, above all, live music....