The Fiat Coupe was designed by Chris Bangle, who is now with BMW and responsiable for the Z-4, X-5, new 5 and 7 series and the forthcoming 6 series.
Did't think he was working for Pinifarina at the times. I thought (may be wrong) that Pinifarina designed the Coupe concept, but the final styling for it was done inhouse (at Fiat) by Chris Bangle.
Those of you in the UK may still be able to pick up a copy of last weeks Autocar that had a big piece on Chris Bangle and his designs; including the Fiat Coupe and the current BMW range.