I thought the daily mail online said he is a pharmacist. hmmm....
Maybe it’s a different guy by the same name .... this is what is on opensecrets.org: http://www.opensecrets.org/indivs/search.php?name=GERSTLE%2C+MARK&state=FL&zip=&employ=&cand=&c2014=Y&c2012=Y&c2010=Y&sort=N&capcode=qmhgz&submit=Submit+your+Donor+Query
I looked at the name of the firm in the link above and thought it was a law firm, my bad. It’s a CPA firm.