David, "the Scientist Guy" a physicist with whom Phoebe falls in love with in "The One with the Monkey", when he receives an academic grant for a three year research trip to Minks. After a quarrel with his research partner Max (Wayne Pére), David decides to take the trip, breaking Phoebe's heart. Seven years later, he returns to New York for a brief visit and shares an evening with Phoebe.