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William Langhorne (born July 29, 1974, in Washington, D.C.), is a race car driver sponsored by Porsche. He is also a former driver in the Indy Racing League. After coming up through karting and the Skip Barber Racing Schools, he drove in the Barber Dodge Pro Series from 1997 to 1999 and Toyota Atlantic in 1999 and 2000. He reached his goal of top-level open-wheel racing when he competed in the 2002 IRL season with 3 starts for Treadway Racing. His best career IRL finish was in 13th position in the Delphi Indy 300 at the Chicagoland Speedway. In 2003, he raced in Formula 3000 for BCN Competicion. In 2004 and 2005 he raced in the ARCA ReMax Series. In 2006 he raced for Molitor Racing in the Porsche Michelin Supercup Series that tours with Formula One.

He is an alumnus of Burke Mountain Academy and Babson College.

Racing record

American Open Wheel

(key)

Indy Racing League

Year	Team	Chassis	Engine	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	Pos.	Pts	Ref
2002	Treadway Racing	G-Force GF05B	Chevrolet Indy V8	HMS	PHX	FON	NZR	INDY	TXS	PPIR	RIR	KAN	NSH	MCH	KTY 18	STL	CHI 13	TX2 23	35th	36	^[1]

Complete Porsche Supercup results

(key) (Races in bold indicate pole position) (Races in italics indicate fastest lap)

Year	Team	1	2	3	4	5	6	7	8	9	10	11	12	13	Pos.	Pts
2002	Kadach Tuning + Service	ITA	ESP	AUT	MON	GER	GBR	GER	HUN	BEL	ITA	USA Ret	USA 12		NC	0‡
2006	MRS-PC Service Team PZM	BHR	ITA	GER	ESP	MON	GBR	USA 11	USA 14	FRA 15	GER 15	HUN 16	ITA 15		NC	0‡
2007	MRS Team	BHR 13	BHR 15	ESP 27	MON 10	FRA 9	GBR 24	GER 19	HUN 22	TUR 9	BEL 17	ITA 15			16th	33
2008	Veltins MRS Racing	BHR	BHR	ESP	TUR	MON	FRA	GBR	GER 21	HUN 18	ESP Ret	BEL 16	ITA 13		NC	0‡
2009	SANITEC Racing	BHR 7	BHR 12	ESP Ret	MON 13	TUR 11	GBR Ret	GER 15	HUN 10	ESP 7	BEL 11	ITA 12	UAE 8	UAE 14	12th	72
2010	SANITEC GILTRAP Racing	BHR 16	BHR 16	ESP 13	MON 16	ESP Ret	GBR 16	GER 14	HUN Ret	BEL 13	ITA 14				18th	25
2011	SANITEC Aquiles MRS Team	TUR 14	ESP Ret	MON 16	GER 13	GBR 20	GER 10	HUN 14	BEL 19	ITA 17	UAE 16	UAE 16			15th	33
2012	MRS GT-Racing	BHR	BHR	MON 13	ESP	GBR	GER	HUN	HUN	BEL	ITA				21st	6

Complete International Formula 3000 results

(key) (Races in bold indicate pole position; races in italics indicate fastest lap.)

Year	Entrant	1	2	3	4	5	6	7	8	9	10	Pos.	Pts
2003	BCN F3000	IMO	CAT	A1R	MON 10	NÜR 12	MAG 14	SIL 13	HOC 12	HUN	MNZ	NC	0

ARCA Re/Max Series

(key) (Bold – Pole position awarded by qualifying time. Italics – Pole position earned by points standings or practice time. * – Most laps led.)

ARCA Re/Max Series results
Year	Team	No.	Make	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	ARMSC	Pts
2004	Brent Sherman Racing	04	Ford	DAY	NSH	SLM	KEN	TOL	CLT	KAN	POC	MCH	SBO	BLN	KEN	GTW	POC	LER	NSH	ISF	TOL 13	DSF	CHI	SLM 24	TAL		87th	280
2005	Lee Leslie	44	Ford	DAY	NSH	SLM	KEN	TOL	LAN	MIL	POC	MCH	KAN	KEN	BLN	POC	GTW	LER	NSH	MCH	ISF	TOL 25	DSF	CHI			92nd	285
2005	Bob Schacht Motorsports	75	Ford																						SLM 11	TAL	92nd	285