1966-1979: University of Vienna<br />
Starting in 1966 Falk was an assistant at the [http://www.univie.ac.at/orgchem/ Institute of Organic Chemistry] at the University of Vienna. In 1975 he was promoted to associate  professor of physical organic chemistry at the University of Vienna. In the summer of 1978 Falk was invited to speak at the Gordon Research Conference in Wolfeboro.<br />
1979–present: Johannes Kepler University of Linz<br />
In 1979 Falk received a call to become full professor of organic chemistry at Johannes Kepler University of Linz, where he founded the new
[http://www.orc.uni-linz.ac.at/ Institute of Organic Chemistry]. From 1989 through 1991 he was elected Dean of the  Faculty  of Engineering and Natural Sciences ([http://www.tn.jku.at/ TNF]) at Johannes Kepler University of Linz. In 2005 Falk was ranked #3 among the "Top 10" scientists in Upper Austria by the newspaper "OÖ Nachrichten". In 2008 he retired as Professor emeritus at the Institute of Organic chemistry of the JKU.