Manurung is an Of Counsel of Hadipurwanto Law Office. He graduated with a Bachelor degree from faculty of law Universitas Sumatera Utara in 1981 majoring in Criminal Law and earned his Magister degree from faculty of law Universitas Ekasakti in 2003 majoring in Business Law. He has been practicing legal professional in various courts in Indonesia such as District Court, State Administrative Court, State Administrative High Court, Constitutional Court of the Republic of Indonesia, Central Information Commission of the Republic of Indonesia, etc.
Prior to joining Hadipurwanto Law Office in 2018, he has been worked in Indonesian National Police (Kepolisian Negara Republik Indonesia) and served in many position as Vice Head of District Police, Head of District Police, Vice Head of Samapta, and then assigned in Legal Division of Police’s Headquarters as Main Advocate with rank Police Grand Commissioner (Komisaris Besar Polisi). He is also one of the drafting team in various regulation making apart from police institution in Indonesia. He is admitted by the Indonesian Bar Association (PERADI) to represent the client before the court in Indonesia.