He served as Greek consul in Vienna, and later as minister to Austria, the Kingdom of Bavaria, and Germany.

He also made major donations to various educational and scientific foundations in Austria, Hungary, and Greece.

[12] During his time as Greek ambassador in Vienna, Johann Strauss II composed the Hellenen-Polka (Hellenes Polka) op.

203, at Simon's request, in 1856, for an annual ball of the ethnic Greek community in the Austro-Hungarian Empire.

[2] Sinas was the donator and founder of the Hungarian Academy of Budapest, the Holy Trinity Greek Orthodox Church, Vienna, the Athens Orthodox Cathedral, the Athens Academy, and others.