Riversimple is a United Kingdom-based transportation company focused on producing environmentally conscious automobiles.

Riversimple was founded by former motorsport engineer and racing driver Hugo Spowers.

The Riversimple company designs energy-efficient automobiles, including the Morgan LIFEcar and the Riversimple Urban Car. Several elements are considered during each design, including hydrogen fuel cell power sources, lightweight carbon fibre composite materials, open source development and design, leasing instead of selling the cars, distributing manufacturing among many small companies, and broad corporate ownership.

Hugo Spowers (born 1960) is a British entrepreneur-engineer who co-ordinated the development of the Morgan LIFEcar sports car project that was launched at the Geneva Motor Show in March 2008, and the Riversimple Urban Car.

Spowers is the founder of Riversimple (formerly known as OSCar), the company that co-ordinated the design of LIFECar, and is currently developing the Riversimple Urban Car, a viable hydrogen fuel cell car for urban use. Spowers is a graduate of the University of Oxford, and Cranfield University.

Whilst an undergraduate at Oxford University in the late seventies and early eighties, Spowers was an active member of the extreme sports society, the Dangerous Sports Club.

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David Michael Letterman (born April 12, 1947) is an American television host and comedian. He hosts the late night television talk show, Late Show with David Letterman, broadcast on CBS. Letterman has been a fixture on late night television since the 1982 debut of Late Night with David Letterman on NBC. Letterman recently surpassed friend and mentor Johnny Carson for having the longest late-night hosting career in the United States of America.

Letterman is also a television and film producer. His company Worldwide Pants produces his show as well as its network follow-up The Late Late Show with Craig Ferguson. Worldwide Pants has also produced several prime-time comedies, the most successful of which was Everybody Loves Raymond, currently in syndication.

In 1996, David Letterman was ranked #45 on TV Guide's 50 Greatest TV Stars of All Time.

Letterman was born in Indianapolis, Indiana. His father, Harry Joseph Letterman (April 1915 – February 1973), was a florist of British descent; his mother Dorothy Letterman (née Hofert, now Dorothy Mengering), a Presbyterian church secretary of German descent, is an occasional figure on the show, usually at holidays and birthdays.