Peter Gregg was born on May 4, 1940, in New York City. His father was a mechanical engineer who was involved in the manufacture of marine incinerators. He was accustomed to live financially comfortable and always did everything to maintain his way of life.
He graduated from Harvard, then moved to Europe where he attended the Centro-Sud driving school. His career seemed to be set for bank directorship but he got then involved in auto racing, which began to grow as a hobby.
He enlisted in the US Navy and became an Air Intelligence Officer. He began his racing career with gymkhanas and ice races. In 1962, he pursued his motorsports career with the SCCA. He was discharged from the Navy in 1965. From that moment, auto racing became his true racing passion. He took over a local Porsche agency in 1965, Brumos, which he purchased from founder Hubert Brundage, after his death. He then acquired a Mercedes Benz dealership, then another, which offered Fiats and MGs.
He had become a Porsche racer in 1964, with a 904. He was the SCCA Southeastern Division in 1967 in two classes. He entered the Trans Am series Under 2-litre in 1968 and won the title the next year. In 1971, he moved to the big guns, driving a Ford Mustang for Bud Moore. Then he became a true winner and won the Championship in 1973 and 1974. He became then a genuine professional racer, totally devoted to his passion. He entered IMSA from the start and won in 1971 and 1973. He won the 24 Hours of Daytona in 1973, beating the prototypes : it was probably one of his greatest accomplishments. His long lived association with Hurley Haywood was one of the most successful ever in the series. Curiously, he announced his retirement shortly after, prefering his life as the Jacksonville National Bank director, but he retracted very fast. He came back to IMSA racing and became one of the most successful driver ever. He won the Championship in 1974, 1975, 1978 and 1979 .
He became renowned for his ultra professional behaviour. His cars were always impeccably prepared and he had set high standards in Sportscar Racing. The reputation of the white-blue and red Porsches have long outstretched the US borders. He had knitted very close links with the Porsche factory in Germany and benefitted from extra features his opponents had not. More powerful engines or better spare parts were always dedicated to his racing operation. It was clear that he was Porsche official US representative in IMSA racing. It was one of his privileges but he deserved them, no one can deny it.
In 1980, he had hard times with an outdated car. He had to fight hard against a dominating John Fitzpatrick. He participated in the 24 Hours of Le Mans but had a road accident when heading to the practice session. He was left with vision troubles which remained permanent. This led him to a depressive state and as he saw no improvement, he felt his career was over. It was a situation he probably could not bear. He commited suicide on 15th December 1980. America's best road racing driver left us in a sudden yet unexpected way. It was a great loss for Auto Racing and IMSA.
From the beginning of his career, he has always run on Porsches, except in 1976, the year he entered an ex-factory BMW 3.0CSL. He drove almost every kind of Porsche car, from the 914/6, 911S, Carrera RSR, 934 to the 935, with an equal success. His excellence has been an example for every IMSA driver.
1971 Results : IMSA Champion
Car : Porsche 914/6 Brumos Racing #59
| VIR | 1 |
| Talladega | 2 |
| Charlotte | 2 |
| Bridgehampton | 1 |
| Summit Point | 1 |
| Daytona | 4 |
1972 Results : 4th
Car : Porsche 911S Brumos Racing #59
| Texas | 2 |
| Daytona | 30 |
| VIR | 1 |
| Lime Rock | 26 |
| Donnybrooke | NR |
| Mid Ohio | NR |
| Talladega | NR |
| Watkins Glen | 1 |
| Bryar | 16 |
| Daytona | 6 |
1973 Results : IMSA Champion
Car : Porsche Carrera RSR Brumos Racing #59
Peter Gregg won the 24 Hours of Daytona on this Porsche Carrera RSR, he went on to win the IMSA Championship that year with a similar carCopyright Bill Oursler
| Daytona | 1 |
| Pocono | NR |
| Daytona | 2 |
| Mid Ohio | NR |
| Lime Rock 1 | 2 |
| Lime Rock 2 | 1 |
| Atlanta | 1 |
| Indianapolis | 1 |
| Daytona | 1 |
1974 Results : IMSA Champion
Car : Porsche Carrera RSR Brumos Racing #59
| Atlanta | 18 |
| Laguna Seca 1 | 3 |
| Laguna Seca 2 | 36 |
| Ontario | 1 |
| Mid Ohio | 1 |
| Daytona | 4 |
| Talladega | 4 |
| Lime Rock 1 | 1 |
| Lime Rock 2 | 7 |
| Mexico | 27 |
| Daytona | 8 |
| Atlanta | 1 |
| Indianapolis | 1 |
| Daytona | 1 |
1975 Results : IMSA Champion
Car : Porsche Carrera RSR Brumos Racing #59
| Daytona | 1 |
| Sebring | 53 |
| Atlanta 1 | 1 |
| Atlanta 2 | 4 |
| Laguna Seca 1 | 1 |
| Laguna Seca 2 | 4 |
| Riverside | 3 |
| Lime Rock 1 | 1 |
| Lime Rock 2 | 2 |
| Mid Ohio | 26 |
| Mosport | 4 |
| Daytona | 37 |
| Mid America 1 | 2 |
| Mid America 2 | 2 |
| Talladega | 2 |
| Mid Ohio | 9 |
| Daytona | 4 |
1976 Results : 2nd
Car : BMW 3.0 CSL Peter Gregg Racing #59
Peter Gregg had a good season in 1976, driving a BMW 3.0CSL for his only non-Porsche Championship
Copyright Dave Kutz
| Daytona | 1 |
| Sebring | 53 |
| Atlanta | 3 |
| Laguna Seca | 2 |
| Ontario | 2 |
| Lime Rock | 23 |
| Mid Ohio | 4 |
| Daytona | 3 |
| Sears Point | 3 |
| Talladega | 1 |
| Pocono | 2 |
| Mid Ohio | 2 |
| Atlanta | 16 |
| Laguna Seca | 2 |
| Daytona | 51 |
1977 Results : 25th
Car : Porsche 934 Brumos Racing #59 and Porsche 935 Brumos Racing #59 he entered at the Mid Ohio special event featuring Gr5 cars.
Peter Gregg ran a very limited schedule in 1977, concentrating on the Trans Am Championship, he is at the wheel of his Porsche 934 at Sebring where he finished 3rd overallCopyright Dave Kutz
| Daytona | 10 |
| Sebring | 3 |
| Mid Ohio | 1 |
1978 Results : IMSA Champion
Car : Porsche 935 Brumos Racing #59
| Daytona | 1 |
| Sebring | 69 |
| Talladega | 1 |
| Atlanta | 1 |
| Laguna Seca | 3 |
| Hallett | 13 |
| Lime Rock | 1 |
| Brainerd | 1 |
| Daytona | 1 |
| Sears Point | 26 |
| Portland | 1 |
| Mid Ohio | 35 |
| Atlanta | 1 |
| Daytona | 1 |
1979 Results : IMSA Champion
Car : Porsche 935 Brumos Racing #59
Peter Gregg at the Daytona Finale in 1979. This year would be his last Championship
Copyright Mike Heselton
| Daytona | 32 |
| Sebring | 26 |
| Atlanta | 1 |
| Riverside | 5 |
| Laguna Seca | 1 |
| Hallett | 2 |
| Lime Rock | 1 |
| Brainerd | 1 |
| Daytona | 3 |
| Mid Ohio | 1 |
| Sears Point | 1 |
| Portland | 1 |
| Mid Ohio | 14 |
| Road America | 32 |
| Atlanta | 1 |
| Daytona | 39 |
1980 Results : 10th
Car : Porsche 935 Brumos Racing #59. He had his accident when going to a practice session in Le Mans, France. From that moment, he suffered from diplopia, and it prevented him from racing anymore. It is this situation that eventually led him to commit suicide.
| Daytona | 11 |
| Sebring | 10 |
| Atlanta | 3 |
| Riverside | 54 |
| Laguna Seca | 2 |
| Lime Rock | 14 |
| Daytona | 3 |
