I tried to find a 100% kosher link, mods please let this through:
http://www.torah.org/advanced/haaros/5758/out2-43.html
If the link doesn’t work, you can google “Benjamin Franklin Mussar Movement”
Basically, he developed a program where you work on one middah at a time, and slowly growing and moving on to the next middah. This was incorporated into an early mussar sefer, and eventually into R’ Yisrael Salanter’s sefer. So, one can argue that not only is BF a Founding Father of the US, he’s also a FF of the Mussar Movement.
Which is interesting because he was extremely famous for being not the most “moral” person in certain issues.