rubrician

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A person learned in the rubrics of ritual.

from The Century Dictionary.

• noun One who is versed in or who adheros to the rubric.

from the GNU version of the Collaborative International Dictionary of English.

• noun One skilled in, or tenaciously adhering to, the rubric or rubrics.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun One skilled in, or tenaciously adhering to, the rubric or rubrics.