His teachers were André Luy, Lionel Rogg, Jean Micault, Hans Drewanz and Hartmut Schmidt.
Also, since 1991, he has held a teaching position for vocal correpetition at the Hochschule für Musik und Darstellende Kunst Mannheim.
Freitag is the initiator of the carillon in the Kaiserslautern Collegiate Church, which was installed in 2009 and, with 47 bells, is one of the largest instruments of its kind in Germany.
with the dissertation Komponisten der Naheregion:Gerhard Fischer-Münster, Fridel Grenz, Magdalene Schauss-Flake, Dieter Wellmann.
Studien zur regionalen Kirchenmusik unter besonderer Berücksichtigung der Werke für Orgel.