A: On page 440, RONR says that "The presiding officer of an assembly - especially of a large one - should be chosen principally for the ability to preside. This person should be well versed in parliamentary law and should be thoroughly familiar with the bylaws and other rules of the organization - even if he or she is to have the assistance of a parliamentarian."

On page 445, it says, "A presiding officer should make every effort to know more parliamentary procedure than other members ...."

So, is the president obligated to be a parliamentarian? No, but it's the difference between "should" and "must."