Santa Claus
Santa Claus, also known as Saint Nicholas, Kris Kringle, Father Christmas, or simply Santa, is a legendary figure originating in Western Christian culture who is said to bring gifts to the homes of well-behaved ("good" or "nice") children on Christmas Eve (24 December) and the early morning hours of Christmas Day (25 December). The modern Santa Claus grew out of traditions surrounding the historical Saint Nicholas (a fourth-century Greek bishop and gift-giver of Myra), the British figure of Father Christmas and the Dutch figure of "Sinterklaas" (himself also based on Saint Nicholas). Some maintain Santa Claus also absorbed elements of the Germanic god Wodan, who was associated with the pagan midwinter event of Yule and led the Wild Hunt, a ghostly procession through the sky.
Haddon Sundblom
Sundblom is best remembered for his advertising work, specifically the Santa Claus advertisements he painted for The Coca-Cola Company starting in 1931. Sundblom's Claus firmly established the larger-than-life, grandfatherly Claus as a key figure in American Christmas imagery. So popular were Sundblom's images of Claus (Sundblom's images are used by Coca-Cola to this day) that Sundblom is often credited has having "created" the modern image of Santa Claus.