Who are some successful/famous scientists or biologists that did not
have any formal training in their field or even a college degree?  I
have already came up with Edison, Galileo, Pasteur and Da Vinci from a
simple Google search.

I don't know what Einstein's training was, but if I recall correctly
he was working in a telegraph office when he developed Relativity.

Charles Darwin (evolution) trained as a physician and theologian;
Michael Faraday (electromagnetism) was essentially self-taught: Louis
Agassiz (geology and paleontology) trained as a physician.

http://en.wikipedia.org/wiki/Charles_Darwin

http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Faraday.html

http://www.ucmp.berkeley.edu/history/agassiz.html

Correction about Einstein. He had a college diploma in mathematics and
physics when he began working at the Swiss patent office. He earned
his doctorate in physics in the same year (1905) that he wrote his
first paper on relativity.

Gregor Mendel (Geneticist) was a monk...and since he first explained
the model of inheritance of traits I don't think it's possible he had
any training.