From 1839/40 he worked as a freelance architect, Otto Wagner, among others, was a member of his studio. 1846–52 Förster worked with his son-in-law Theophil Freiherr von Hansen. He contributed to the Ringstraße. Berlin-educated Ignaz Wechselmann became his friend and assistant and superintended the construction of the Dohány Street Synagogue in Budapest, which along with the Leopoldstädter Tempel and the Synagogue of Miskolc is Förster's most important work.
1861–63 he was a member of the Viennese city council (Gemeinderat).
Förster's sons, Heinrich and Emil, were also architects.
- Theater Reduta, Bürgerhäuser, Brno (1831)
- Evangelische Kirche Gumpendorf (1849)
- Villa Pereira, Königstetten (1849)
- Arsenal, Vienna (1849-1856)
- Maria-Hilf-Kirche, Vienna (1854)
- Dohány Street Synagogue, Budapest (1854-1859)
- Augarten-Casino, Brno (1855)
- Leopoldstädter Tempel, Vienna (1858)
- Elisabethbrücke, Vienna (1858, demolished 1897)
- Synagogue of Miskolc, Miskolc, 1863
- Palais Todesco, Vienna (1863)
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