Senator Ziga was born on September 30, 1945 in Manila to Venancio Ziga, former governor of Albay and Tecla San Andres Ziga, former Senator.
Senator Ziga was a graduate of the Ateneo de Manila University, the University of Sto. Tomas and the University of California in Los Angeles and was admitted to the bar in 1975.
He ran and won in the 1984 Batasang Pambansa elections and won. He filed various bills like the establishment of the National Rehabilitation Center for drug addicts, requiring secondary schools to teach drug addiction and abuse and increasing the minimum basic monthly salaries of public school teachers.
In 1986, he was appointed Minister of General Services and became a Senator and served as Chairman of the Commission on Appointments, Senate Electoral Tribunal and 16 committees.
Senator Ziga's interest and concern for those who have less in life is reflected in his association and involvement in typhoon relief operations and civic organizations, such as the free Medical Eye Specialist Mission and the Medical Mission of the Philippine General Hospital.
Senator Ziga is married to Carmen Velasco with whom he has five children.