Dr Pepper is a well known soft drink marketed in North America, South America and Europe by Dr Pepper Snapple Group. It was invented by Charles Alderton. The headquarters are situated in Plano, Texas, a suburb of Dallas. There is also a no-sugar version, Diet Dr Pepper, as well as a line of flavored versions first introduced in the 2000s. W.W. Clements, a former CEO and president of the Dr Pepper/7-Up Company, described the taste of Dr Pepper as one of a kind, saying "I've always maintained you can't tell anyone what Dr Pepper tastes like because it's so different. It's not an apple, it's not an orange, it's not a strawberry, it's not a root beer, it's not even a cola. It's a different kind of drink with a unique taste all its own."