Justice Peter Mohan Maithree Peiris, PC was the 43rd de facto Chief Justice of Sri Lanka. He previously held the post of Attorney General. During this time he was trained at the National Institute of Trial Advocacy of the Harvard Law School, at the Centre for Police and Criminal Justice Studies of the Jesus College, Cambridge and at George Washington University.
Peiris was appointed Senior Legal Officer to the Cabinet in September 2011. He became chairman of Seylan Bank in April 2012.
He represented Sri Lanka in The UN Committee Against Torture in 2011. Peiris was nominated to be Chief Justice by President Mahinda Rajapaksa following the controversial impeachment of Shirani Bandaranayake. The Parliamentary Council gave its approval for Peiris's appointment on 15 January 2013.