Is this sentence correct? if not, how can i fix it?

mark wolfson, phd, alexander c. wagenaar, phd, and gary w. hornseth, ba did a four-state study.

i wasn't sure if the titles are allowed like that, but i have to give the authors 'clout,' as my professor would say.

this is for an essay i am writing and it's too late to email my professor. however, my essay is due tonight. so much for any clarification!