Information:  - The IndyCar Series (currently known as the Verizon IndyCar Series for sponsorship reasons) is the premier level of open wheel racing in North America. Its parent company began in 1996 as a competitor to CART known as the Indy Racing League (IRL) which was created by then Indianapolis Motor Speedway owner Tony George. In 2008, the IndyCar Series merged with the Champ Car World Series (formerly CART). The series is sanctioned by INDYCAR.  - Memorial Day is a federal holiday in the United States for remembering the people who died while serving in the country's armed forces. The holiday, which is observed every year on the last Monday of May, originated as Decoration Day after the American Civil War in 1868, when the Grand Army of the Republic, an organization of Union veterans founded in Decatur, Illinois, established it as a time for the nation to decorate the graves of the Union war dead with flowers. By the 20th century, competing Union and Confederate holiday traditions, celebrated on different days, had merged, and Memorial Day eventually extended to honor all Americans who died while in the military service. It marks the start of the unofficial summer vacation season, while Labor Day marks its end.  - Michael "Mike" Lanigan is an entrepreneur and IndyCar Series team owner.  - Buddy Rice (born January 31, 1976) is an American racecar driver. He is best known for winning the 2004 Indianapolis 500 while driving for Rahal Letterman Racing, and the 2009 24 Hours of Daytona for Brumos Racing.  - A suburb is a residential area or a mixed use area, either existing as part of a city or urban area or as a separate residential community within commuting distance of a city. In most English-speaking regions, suburban areas are defined in contrast to central or inner city areas, but in Australian English and South African English, "suburb" has become largely synonymous with what is called a "neighborhood" in other countries and the term extends to inner city areas. In some areas, such as Australia, China, New Zealand, the United Kingdom, and a few U.S. states, new suburbs are routinely annexed by adjacent cities. In others, such as Arabia, Canada, France, and much of the United States, many suburbs remain separate municipalities or are governed as part of a larger local government area such as a county.  - Rahal Letterman Lanigan Racing is an auto racing team that currently races in the United SportsCar Championship and the IndyCar Series. Based in Hilliard, Ohio, it is co-owned by 1986 Indianapolis 500 winner Bobby Rahal, former television talk show host David Letterman, and businessman Mike Lanigan.  - Robert "Bobby" Woodward Rahal (born January 10, 1953 in Medina, Ohio) is an American auto racing driver and team owner. As a driver, he won three championships and 24 races in the CART open-wheel series, including the 1986 Indianapolis 500. He also won the 2004 Indianapolis 500 as a team owner for the winning driver, Buddy Rice.  - The Indianapolis 500 is an automobile race held annually at Indianapolis Motor Speedway in Speedway, Indiana, an enclave suburb of Indianapolis, Indiana. The event is held over Memorial Day (originally Decoration Day) weekend, which is typically the last weekend in May. It is contested as part of the Verizon IndyCar Series, the top level of American Championship Car racing, an open-wheel formula colloquially known as "Indy Car Racing". The name of the race is often shortened to Indy 500.  - The 70th Indianapolis 500 was held at the Indianapolis Motor Speedway in Speedway, Indiana on Saturday, May 31, 1986. After being rained out on May 2526, the race was rescheduled for the following weekend. Bobby Rahal was the winner, becoming the first driver in Indy history to complete the in less than three hours.  - Hilliard is a city in Franklin County, Ohio, United States. The population was 28,435 at the 2010 census with a census estimate of 31,012 in 2013. It is a suburb of Columbus, Ohio and part of Norwich Township. Hilliard is the home of the Early Television Museum.  - David Michael Letterman (born April 12, 1947) is an American former television talk show host, comedian, writer, producer and actor.  - Anton Hulman "Tony" George (born December 30, 1959) is the chairman and former President and CEO of the Indianapolis Motor Speedway and Hulman & Company, serving from 1989 to 2009. He was also formerly on the Board of Directors of both entities. He founded the Indy Racing League and co-owned Vision Racing. Many commentators, such as Gordon Kirby, suggest that George's actions at the head of the Indianapolis Motor Speedway and in creating the IRL to rival the then-dominant CART led to a sharp decline in popularity of open-wheel racing in the United States as it split the fanbase, and gave a significant boost to the national popularity of NASCAR.  - Graham Robert Rahal ( born January 4 , 1989 ) is an American race car driver . He currently participates in the IndyCar Series with Rahal Letterman Lanigan Racing , a team part - owned by his father Bobby Rahal , the winner of the 1986 Indianapolis 500 .    What entity does 'graham rahal' has the relation 'occupation' with?
Answer:
racecar driver