Egypt's Supreme Constitutional Court (SCC) appointed on Sunday judge Abdel-Wahab Abdel-Razek as the successor to the court's current head, Adly Mansour, who is set to retire on 30 June.
The decision was taken during a Sunday meeting of the court's judges.
According to Article 193 of the constitution, the head of the court is selected from among the three most senior aides to the court's sitting head.
Abdel-Razek, the first aide to Mansour, graduated from Cairo University's Faculty of Law in 1969.
He worked at the Central Auditing Organisation upon his graduation until 1971, later holding several prosecutorial posts before moving on to the SCC in 2001.
The court's current head, Mansour, reached the SCC's retirement age of 70 last December.
Mansour was appointed the head of the court in July 2013, the same month when he assumed the post of interim president for one year following the ouster of Islamist president Mohamed Morsi.
The appointing of both Abdel-Razek and Mansour as SCC heads is in accordance with a law issued in 2011, which stipulates that heads of the court are to be appointed from within the constitutional court itself.
For over 20 years, the SCC head was chosen from outside the constitutional court.
According to the constitution, the president of the republic is to issue a decree announcing the appointment of the new head in the state's official paper.