A few days ago, I submitted to you a list of five sites with information regarding epistemology.  Today, I went back and again perused the sites to ascertain whether or not they could be of assistance to you with regard to key contributors.  Together with their embedded links, as well as bibliographies, I believe these same sites offer the answers you seek, including schools of thought.  Although these five are certainly not the only reference tools on the subject of epistemology, I do believe that with careful review and study, you will find these sites helpful.  Here they are, again.

http://pespmc1.vub.ac.be/EPISTEMI.html

http://www.bookrags.com/Epistemology

http://thirdmill.org/newfiles/joh_frame/Frame.HE2005.HistoryofEpistemologyContents.pdf

http://www.history.com/encyclopedia.do?articleId=208627

http://www.objectivistcenter.org/cth--44-Foundations_Study_Guide_Epistemology.aspx