Hon. Datuk Radin Malleh was born on 5 November 1950 in Tenom. He is married to Angeline Tom and they have 4 children.

Datuk Radin serves as the chief executive officer of the party. He has a varied professional background and served for a lengthy period as a senior officer with the Malaysian police before joining PBS in 1990.

He is also a qualified lawyer, having earned an LLB degree from the University of Kent, United Kingdom in 1986. Datuk Radin is a two-term member of parliament. He previously served as MP for the Padas constituency (1990-1995) and the Tenom constituency (1995-1999). He is currently the Assemblyman for N.30 Melalap since 13 March 1999 and heads the PBS Melalap Division.

Radin was appointed as the Assistant Minister in the Chief Minister's Department in March 2004.

For his numerous contributions to the state, he was awarded the Panglima Gemilang Darjah Kinabalu (PGDK) medal in 2002 which carries the title "Datuk" and the Ahli Setia Darjah Kinabalu (ASDK) in 1993 by the TYT Yang di Pertua Negeri Sabah.

Prior to assuming the post of PBS Secretary General in 1994, Datuk Radin was one of the party's Vice President. He is also known for his special interest in the arts, including folklore and poetry, and has a large collection of personally-composed malay pantun to his credit.