Trained with the the British Ministry of Defence as a research engineer in rocketry, Holloway was recruited in 1975 - at the age of 24 - to Robin Herd of March Engineering. A well known talent-spotter, Herd shared a passion for soccer with his young engineer - an interest which still binds them together. Holloway worked his way up through the ranks at March Engineering. He started out as a toolmaker but moved on to the drawing boards as a design draughtsman. This led to work as a track engineer with the March Formula 2 factory team in the mid 1980s. He became assistant chief draughtsman under designer Gordon Coppuck and ultimately director of engineering with the March F1 team in 1987. The team was then taken over by the Leyton House company from Japan and, after a promising 1988 season with the Adrian Newey-designed March 881, results failed to come in 1989 and the old regime was ousted in 1990.Holloway went back to work with Herd at March PLC but that too was falling apart and so in 1992 Holloway, Herd, engineer Tino Belli and manager Les McTaggart - all ex-March men - set up their own independent design company. It was called Fomet 1 and its objective was to design a Formula 1 car for Gabriele Rumi's Fondmetal F1 team. The first Fomet 1 chassis was driven by Olivier Grouillard in 1991 and the results were encouraging but Fomet 1 and Rumi fell out at the end of the year and Herd and his gang went off to work with the Venturi Larrousse team, changing Fomet 1's name to Larrousse UK Ltd. and designing a car for 1992. The LC92 was driven by Bertrand Gachot and Ukyo Katayama, Gachot - who was engineered by Holloway - scoring a point at Monaco.In 1993 and 1994 Holloway worked as race engineer for Erik Comas, while continuing his design work. When it became clear that Larrousse was not going to compete in F1 in 1995, the design bureau in England changed its name again to become GenTech and signed an exclusive contract to help the Forsythe Racing Indycar team develop Teo Fabi's Reynard-Ford, but Holloway wanted to stay in F1 and so left Herd after nearly 20 years and joined Gary Anderson's engineering team at Jordan working with Rubens Barrichello in 1995 and Martin Brundle in 1996. After suffering a heart attack Holloway spent a couple of years working on the Jordan test team but then returned to the race team as head of engineering. In 2000 he stepped in to lead the design team for the Jordan-Honda EJ11 after Mike Gascoyne left for Benetton. He left the team in the Spring of 2002.