He was taught the harpsichord in Vienna by Georg Christoph Wagenseil and established himself around 1770 in Prague as a successful keyboard teacher.
Wolfgang Amadeus Mozart was probably his guest in his Villa Bertramka in Košíře, just outside Prague, although no documentation exists to support claims originating in nineteenth-century literature that he stayed there frequently.
Karl Thomas was not himself a witness to the incident reported, rather he only heard about it from friends of Mozart whom he met as a child in Prague during the 1790s.
[1] Furthermore, there is no documentation to support widespread claims that Mozart completed the operas Don Giovanni and La clemenza di Tito at the Bertramka, or indeed that he even worked on them there.
The Austrian-Australian composer Eric Gross (1926–2011) wrote three suites for violin and orchestra, named Dussekiana I-III, based on piano pieces of František Xaver Dussek.