Although not a trained scientist, Horák worked for many years as a research assistant at the Czechoslovak Academy of Sciences and used knowledge gained there in his dog breeding.
Academy Awards | United States Military Academy | Russian Academy of Sciences | National Academy of Sciences | American Academy of Arts and Sciences | Academy Award for Best Foreign Language Film | United States Naval Academy | United States Air Force Academy | Royal Academy of Music | Academy of Motion Picture Arts and Sciences | Brooklyn Academy of Music | Phillips Academy | Royal Military Academy Sandhurst | Phillips Exeter Academy | Chinese Academy of Sciences | British Academy of Film and Television Arts | National Academy of Engineering | Pennsylvania Academy of the Fine Arts | Academy of Fine Arts | British Academy | Academy Award for Best Picture | Bulgarian Academy of Sciences | Polish Academy of Sciences | Academy Award for Best Visual Effects | New York Academy of Sciences | Academy Award for Best Original Song | Jan Matejko Academy of Fine Arts | Sibelius Academy | National Defence Academy | French Academy of Sciences |
While still just a researcher at the Oriental Institute of the Czechoslovak Academy of Sciences, he taught Bengali at the Faculty of Arts, Charles University (1950–1968).
Since 1976 Erik De Clercq has collaborated on the development of new antiretroviral drugs with Antonín Holý, of the Institute of Organic Chemistry and Biochemistry (IOCB) of the Czechoslovak Academy of Sciences in Prague, Czech Republic.
Between 1983 and 1986 he had been working as a researcher at the Czechoslovak Academy of Sciences, where he received the PhD in Oncology.