I suggest:
Chair or Steward (ala Gondor)
Vice-Chair (or Vice-Steward)
Tournament Advocate -- In charge of Tournies and ratings system.
Online Play Coordinator -- Works with tournament coordinator, or this could be part of Tourny advocates job, to organize online tournaments and ratings.
Rules Advocate or Rules Wizard, Giver of Council -- In charge of rules questions and leader of any councils called to resolve serious rules questions: erratas, bans, restrictions, etc. Develops CRD etc.
Players Advocate -- keeps the pulse of the players community. The official go-between from the PC to the players. Reveals the spoilers, runs polls, contests, etc.
International Coordinator -- Works with Tourny and Players Advocates to maintain and coordinate all events and reach out to all players groups.
Background teams and committees:
Graphic design team -- Designs the templates and finishes the V-cards, errata slips, creates the pdf documents for the CRD, rules, etc.
Design Team -- Designs V-Card sets and themes. Hopefully 3 sets a year.
Playtesting Team -- Works with the design team to playtest V-Sets before they are released. Can be done in playgroups or via SdA, gccg, lackey, etc.
Format Committees--probably a committtee for each format, to insure that cards are refreshing each format and that the formats are balanced.
I propose people can have positions and be in committees too, even in more than one. The important part is that work gets done.