In 1971, he studied law in the Tel Aviv University (magna cum laude), and was admitted to the Israeli Bar in 1977.
He founded the leading law firm, Melcer and Co., specializing in public law, communication law, infrastructure law, and commercial law.
He was also responsible for the legal aspects of key infrastructure projects in Israel, such as the Cross-Israel Highway, the Ben-Gurion Airport Terminal 2000 Project, the Israeli initiative for the underwater wire communication cable, the Israeli Civil Satellite, and the Light Railway Project in Tel Aviv. He also lectured in the leading law faculties in Israel.
Justice Melcer was appointed as Justice of the Supreme Court of Israel in 2007, and in 2017 he was sworn-in as the Deputy President of the Supreme Court.
On April 12th, 2021, he retired at the age of 70 (mandatory under the Israeli Law).