Arnoux in Dallas 1984

I took this at the one and only 1984 Dallas F1 race. Does anyone know who is sitting next to Arnoux? It has always bothered me that I couldn't figure it out. The organizers allocated trucks to all of the teams. They wrote the team's name on the truck door with a marker. Ah, the good ol' days of F1.

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Thank you. That's a good guess but I found images of Piero from the mid-80's on Getty Images and I don't think it's him.