He was a professor in Neuchâtel, Geneva, and Istanbul, headed the legal service of the Federal Department of Foreign Affairs in Bern, and was a member of the Permanent Court of Arbitration in The Hague.

In 1924 he returned to teaching as Professor of Civil, Comparative and International Private Law at the University of Geneva, where he remained until 1954.

[4] In 1934, Sauser-Hall was asked by a Swedish court to give an opinion on the effect of the U.S. Executive Order 6102 on a European contract that provided for payment in gold dollars from a U.S.

[7] In 1937, he reworked this opinion into a course which he delivered at The Hague Academy of International Law on the subject of clauses in public and private contracts requiring payment in gold.

[10][4] He authored numerous legal works as well as a handbook on Swiss civics for foreigners, Guide politique suisse, which reached its seventh edition in 1965.