Mark David Donald Robertson may not be a household name in the entertainment industry vein of, say, Beyoncé, Kim Kardashian or Pharrell Williams, but all three superstars are said to be big fans of the artist and veteran creative visionary who currently serves as the creative director for Estee Lauder Companies and is known in beau monde social media circles as “the Andy Warhol of Instagram” for his whimsical pop art inspired postings that have drawn in almost a quarter million followers (and