Answer by taking a quote from the following article:

Ross James Brawn OBE (born 23 November 1954) is the Formula One Managing Director of Motorsports and technical director. He is also a former motorsport engineer and Formula One team principal. He had worked for a number of Formula One teams, serving as the technical director of the championship-winning Benetton and Ferrari teams. He took a sabbatical from the sport in 2007 but returned to F1 for the 2008 season as Team Principal of Honda.

His career in motorsport began in 1976 when he joined March Engineering in the town of Bicester as a milling machine operator. Soon afterwards he joined their Formula 3 racing team as a mechanic. Brawn was hired by Sir Frank Williams in 1978 as a machinist for the newly formed Williams team. He quickly moved up through the ranks, working in the R&D department with Frank Dernie and as an aerodynamicist in the team's wind tunnel.  Brawn joined the Haas Lola team in 1985 and was part of Neil Oatley's design team at FORCE that produced both the Lola THL1 and THL2 cars used by the team. However, with the 4 cylinder Hart engine in the THL1 and the new Ford V6 turbo powering the THL2, results were scarce against teams like McLaren and Williams with their TAG-Porsche and Honda turbo engines. This was despite the cars generally being regarded by most in the F1 paddock as being the best handling cars on the grid, as well as having 1980 World Champion Alan Jones and former factory Ferrari and Renault driver Patrick Tambay as the drivers. When the Haas team left F1 at the end of the 1986 season, Brawn moved to Arrows. There he designed the Megatron powered Arrows A10 and its update, the A10B for the 1987 and 1988 seasons respectively and the Ford V8 powered Arrows A11 used in 1989.  Later in 1989 Brawn moved to the Jaguar Sportscar racing division, and was lead designer on the Jaguar XJR-14 which won the 1991 World Sportscar Championship.

What did he do there?
He quickly moved up through the ranks, working in the R&D department with Frank Dernie and as an aerodynamicist in the team's wind tunnel.