He's a vandal major, level 8. He'd on earth, past the place with all the planes, through the little chasm where the boats are located. Stick to the right and you'll find him. Same area where you enter the RAS-2 bunker if you have the dlc. The same place where you have dinkle scan those radios on one of the original missions on earth. The one where you find out about rasputin I believe.