 Complete the following phrase:  He participated in three Formula One World Championship Grands Prix, debuting on 27 August 1967. He is the only competitor disqualified from a World Championship race, the 1969 Canadian Grand Prix, for being too slow. He was black-flagged after a series of on-track incidents, the last involving Matra driver Jackie Stewart. In response, Matra owner Ken Tyrrell protested to the officials and had Pease disqualified. At the time, he had completed 22 laps in an uncompetitive car while the leaders had finished 46. His Formula One career was limited to three Canadian Grands Prix, consisting of a non-classification 1967, finishing 43 laps behind the leaders, a failure to start engine trouble in 1968, and a disqualification 