I come up with the following three options to say thank you, but am not satisfied with any of them. Option 1: I would like to thank the members of my PhD committee, Prof. A, Prof. B, Prof. C, Prof. D and Dr. E for... Remark: Repetition of Prof. Option 2: I would like to thank the members of my PhD committee, Professors A, B, C, D and Dr. E for... Remark: Inconsistency between titles: Professor (non abbreviated) vs Dr. (abbreviated). Option 3: I would like to thank the members of my PhD committee, Professors A, B, C, D and Doctor E for... Remark: Doctor E seems unusual to me, as Dr. E is somebody who holds a PhD and not a medical doctor. Does anybody has better suggestions please? Thank you very much for your help! Answer As others have said, how you state these things is not set in stone. Grammar.CCC offers the following on http://grammar.ccc.commnet.edu/grammar/abbreviations.htm Titles before names: Mrs., Mr., Ms., Prof., Dr., Gen., Rep., Sen., St. (for Saint) Notice that Miss is...