Who was the father of Vedavyasa?

HE MARRIES SATYAVATHI and VEDA VYASA is born

Later SATYAVATHI weds SHANTANU AND A FOUNDATION OF MAHABHARAT WAS LAID

DRUTHARASTRA and PANDU.. Destined TO VEDA VYASA as VICHITRA VEERYA dies before the consummation of his marriage with AMBIKA and AMBALIKA