GTA V: Bounty Hunter: Ralph Ostrowski

Ralph Ostrowski can be found at the bottom of the gravel pit.

The first Bounty for Trevor is Ralph Ostrowski. You'll get $10,000 for capturing him alive. To do that, just disable his car into a corner or off a cliff and he will give up. He will say how he is going to do 5 years for cooking the books of some company.