Andreas Nikolaus "Niki" Lauda (born 22 February 1949) is an Austrian former Formula One driver and a three-time F1 World Drivers' Champion, winning in 1975, 1977 and 1984. He is currently the only driver to have been champion for both Ferrari and McLaren, the sport's two most successful constructors. He is considered by some as one of the greatest F1 drivers of all time. More recently an aviation entrepreneur, he has founded and run two airlines (Lauda Air and Niki).

After an unsuccessful start to the 1970s culminating in a disastrous start to the 1973 season, Ferrari regrouped completely under Luca di Montezemolo and were resurgent in 1974. The team's faith in the little-known Lauda was quickly rewarded by a second-place finish in his debut race for the team, the season-opening Argentine Grand Prix. His first Grand Prix (GP) victory - and the first for Ferrari since 1972 - followed only three races later in the Spanish Grand Prix. Although Lauda became the season's pacesetter, achieving six consecutive pole positions, a mixture of inexperience and mechanical unreliability meant Lauda won only one more race that year, the Dutch GP. He finished fourth in the Drivers' Championship and demonstrated immense commitment to testing and improving the car.  The 1975 F1 season started slowly for Lauda; after no better than a fifth-place finish in the first four races, he won four of the next five driving the new Ferrari 312T. His first World Championship was confirmed with a third-place finish at the Italian Grand Prix at Monza; Lauda's teammate Regazzoni won the race and Ferrari clinched their first Constructors' Championship in 11 years; Lauda then picked up a fifth win at the last race of the year, the United States GP at Watkins Glen. He also became the first driver to lap the Nurburgring Nordschleife in under seven minutes, which was considered a huge feat as the Nordschleife section of the Nurburgring was two miles longer than it is today. Lauda famously gave away any trophies he won to his local garage in exchange for his car to be washed and serviced.  Unlike 1975 and despite tensions between Lauda and Montezemolo's successor, Daniele Audetto, Lauda dominated the start of the 1976 F1 season, winning four of the first six races and finishing second in the other two. By the time of his fifth win of the year at the British GP, he had more than double the points of his closest challengers Jody Scheckter and James Hunt, and a second consecutive World Championship appeared a formality. It would be a feat not achieved since Jack Brabham's victories in 1959 and 1960. He also looked set to win the most races in a season, a record held by the late Jim Clark since 1963.

Answer the following question by taking a quote from the article: who did he work with?
Lauda's teammate Regazzoni