Olympique de Marseille relies on Olivier Martin, a lawyer from Lyon, for transfers and player contracts. Who is he and how has he gained the trust of Frank McCourt? Olivier Martin is a lawyer from Lyon who has gained the trust of Frank McCourt due to his legal skills and ability to negotiate player contracts. The club relies on him for transfers and player contracts. Olivier Martin is a valuable man for OM. He has gained the trust of Frank McCourt due to his legal skills and ability to negotiate player contracts. The club relies on him for transfers and player contracts. Olivier Martin is a lawyer from Lyon who has gained the trust of Frank McCourt due to his legal skills and ability to negotiate player contracts. The club relies on him for transfers and player contracts.