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Merzbach was a senior lawyer in Egypt, and one of the guests invited by Sultan Hussein Kamel of Egypt to Abdeen Palace, for official banquets and advice. He had a distinctive legal experience and for that, he became one of the few advisors of Édouard Empain, Baron Empain during the foundation of the Heliopolis suburb. Also, he was one of the lawyers that King Fuad I of Egypt would resort to for legal matters. He was also one of the few lawyers that the Attorney General listened to and took advice from in order to resolve the constitutional crisis between King Fuad I of Egypt and Saad Zaghloul Pasha. Merzbach used to defend the interests of large Egyptian institutions and companies against the British occupants. Merzbach is the founder of the Faculty of Law at Cairo University, which was founded in 1925. And, he was a Professor of Law at Cairo University. Merzbach won the confidence of his fellow lawyers and was elected as the Head of Foreign Lawyers in Egypt in front of the Mixed Courts of Egypt.