Muraoka taught
Semitic languages including
Modern Hebrew as Lecturer in
Manchester University, U.K. (1970–1980), as Professor of
Middle Eastern studies at
Melbourne University (1980–1991), Australia, then moved in 1991 to Leiden University (1991–2003), The Netherlands, as Professor of the Hebrew Language and Literature, the Israelite Antiquities, and the Ugaritic language. In addition, he was editor of
Abr-Nahrain [now
Ancient Near Eastern Studies] 1980–1992, and also edited or co-edited volumes on
Biblical Hebrew Semantics, the Aramaic of
Qumran, and the Hebrew of
Qumran. From 1995–2008 he gave leadership to the Semantics of Ancient Hebrew Database project as its Chairman. His comprehensive syntax of the
Koine Greek of the Septuagint appeared in 2016. He co-founded, in 2000, the Dutch-Japanese-Indonesian Dialogue against the background of the
Pacific War. He was a representative of
The Biblical Church in The Netherlands. ==Retirement and death==