Sommer was born in Mouzon, France, into a wealthy Sedan carpet-making family. His father, Roger Sommer, was himself a record-setter: he broke the Wright Brothers' record for the longest sustained flight in 1909. Raymond did not begin motor racing until 1931, when he entered events in a privateer Chrysler Imperial — a late start for a driver who would go on to dominate one of Europe's most prestigious endurance events within a year.
Sommer's Le Mans debut in 1932 produced an immediate victory, achieved under extraordinary circumstances. His co-driver Luigi Chinetti retired from the race ill, leaving Sommer to drive more than twenty hours of the event solo. He won regardless. In 1933 he returned to win again, this time partnered with Tazio Nuvolari in an Alfa Romeo. Throughout the remainder of the 1930s Sommer consistently led at Le Mans before mechanical failures intervened — on one occasion retiring after twelve laps in front — but his record of having led every Le Mans he entered through 1938 underscored the quality of his pace.
Beyond Le Mans, Sommer accumulated wins across European events throughout the decade. He won the Spa 24 Hours in 1936 with Francesco Severi, took victory at the Grand Prix de Marseilles in 1932 and 1937, and won the Grand Prix de Tunisie in 1937. In 1936 he traveled to Long Island to contest the Vanderbilt Cup, finishing fourth behind winner Nuvolari. That same year he won the French Grand Prix alongside Jean-Pierre Wimille — though that edition was run as a sports car race. He also competed at the La Turbie hill climb and won the Marseilles Three Hours at Miramas.
In the Grand Prix arena, the German factory teams of Mercedes-Benz and Auto Union dominated, and Sommer never won a Grandes Épreuves-qualifying Grand Prix as a result. He was nonetheless a regular top-ten finisher in the sport's most prestigious single-seater events, competing as an independent against works machinery.
During World War II, Sommer played an active part in the French Resistance movement, interrupting a racing career that had reached its competitive peak just as the conflict began.
Racing resumed across Europe in 1946, and Sommer returned immediately. He won the René Le Bègue Cup at Saint-Cloud in 1946. His most historically significant post-war result came in 1947 at the Turin Grand Prix in Valentino Park, where his victory was the first Grand Prix win for Enzo Ferrari operating as an independent constructor — a footnote that connects Sommer directly to the origin of one of motorsport's defining teams. He won the Turin Grand Prix again later in 1947. He also won the Madrid Grand Prix in 1949, and in July 1950 took victory at the Aix les Bains Circuit du Lac Grand Prix driving a Ferrari 166.
The 1950 Formula One World Championship was the first season of the new world series. Sommer entered five rounds, driving for Ferrari in two and in a privately entered Talbot-Lago for three. He retired from four of the five. His sole points finish was fourth place at the Monaco Grand Prix, the second round of the season, where he earned three championship points.
On September 10, 1950, Sommer entered the Grand Prix of the Haute-Garonne near Cadours, France, driving a British Racing Motors 1100cc Cooper. He had led through lap eight and was in the lead on lap nine, in the process of overtaking a car running two laps down, when witnesses observed the rear wheel beginning to separate from its hub. Sommer glanced at the wheel, lost control of the car, and it barrel-rolled twice before coming to rest in a ditch near the track, from which it catapulted into a tree. Sommer was alive immediately after the accident but died minutes later with first responders present. He was found to have a fractured skull.
Sommer's career exemplifies the privateer spirit of pre-war and early post-war European racing — a driver who competed against factory resources with privately prepared machinery and won at the highest level of endurance competition twice over. His Le Mans record, his role at the 1947 Turin Grand Prix, and his participation in the inaugural Formula One season place him at the intersection of several of the sport's most significant moments, even as his death in the same year that the Championship began denied him the chance to develop further within it.
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