William "Bill" Hill was the founder of Hill Valley in 1850. A monument of him still stood in 2015. In 1992, the monument had an inscription that said "The Old Pioneer And His Mule Standing On A Hill". Clara Brown brought the founding father to 1992 to participate in the town's annual Founder's Day Celebration.
- A realistic version of Bill was shown in an illustration from Back in Time: The Unauthorized Back to the Future Chronology.