who or what is Dr. T.J. Eckleburg in the great gatsby in chapter 2?

These are the eyes of Dr. T.J. Eckleburg, an optometrist whose practice has long since ended. Many critics suggest that the eyes symbolize God looking over a sinful land. In George Wilson's case the faded eyes can symbolize the death of the American dream or the American dream being an illusion to begin with. In either case, poor George Wilson has a life that is full of shattered dreams.