On return he received the professorship of vernacular Arabic at the Vienna Polytechnic, a post he surrendered in May 1852 to return to Egypt as the first interpreter of the Austrian Consulate.
He received the vice-consulate (1858), consul in Cairo (1859), the consulate in Galaţi (1862), in Beirut (1870), and became ministerial advisor to the consular ministry in the Ministry of Foreign Affairs appointed to Vienna (1872), where he was elected a member of the Academy of Sciences (1876).
From May 1876 he lived in Cairo as a member of the Egyptian Government Debt Commission and returned to the Viennese Ministry of Foreign Affairs in the spring of 1880. A few months later he was appointed Austrian Minister of Commerce, an appointment he held until mid-February 1881.
Works
Kremer's writings are mostly geographic and ethnographic in nature, especially the
Beiträge zur Geographie des nördlichen Syriens (Contributions to the Geography of Northern Syria), Vienna 1852.
Mittelsyrien und Damaskus (Central Syria and Damascus), Vienna 1853.
Topographie von Damaskus (Topography of Damascus), Vienna 1855.
Ägypten. Forschungen über Land und Volk (Egypt. Research on land and people), Leipzig 1863.
Über die südarabische Sage (About the South Arabian legend), Leipzig 1866.
Beiträge zur arabischen Lexikographie (Contributions to Arabic Lexicography) (Vienna 1883-84, 2 issues);
Über meine Sammlung orientalischer Handschriften (On my collection of oriental manuscripts) (Vienna 1885).
He opposed the Slavic and clerical tendencies in Austria's internal politics in the treatise Die Nationalitätsidee und der Staat (The Nationality Idea and the State) (Vienna 1885).