Alan Morcombe's consultancy agreement which has seen him perform the role as chief executive for the Horsemen's Group will come to an end on December 31.
Morcombe's reign has overseen such initiatives as the Horsemen's Group tariff which was seen as integral to ensuring increased levels of prize-money.
"I have enjoyed my consultancy with the Horsemen's Group and wish them the very best for the future," said Morcombe.
"When I first got involved with racing I was unaware of the splendour of the sport and the dedication shown by many of the professional horsemen involved in it.
"The last two years have been an educating experience and I leave the Horsemen's Group in a stronger position than when I started thanks, in part, to the enormous commitment and support I have received from the executive of the member organisations."
The group is looking to appoint a new chairman for 2013.
8 December 2013Bright start for New Dawn
Twin lights up Hilly Way
Twin lights up Hilly Way
Durkan stroll for Arvika
Unioniste has Lexus aim
New One heading to International
Drowne in hospital after fall
Baby in running for Warwick
Moore sets sights on Kempton
Ex-Oxx ace Mofeed lifts Cup
Cloud and Lantern sunk in Mile
Kanaloa sizzles in Sprint
Dominant shocks The Fugue in Vase
Turner back in business
Faugheen in impressive strike
Flemenstar out of John Durkan
Unioniste claims Listed prize
Grugy great in Tingle Creek
V for victory for Henderson
Chance best in Becher thriller
Hinterland reigns in Henry VIII
Mullins strikes with Gitane
7 December 2013V for victory for Henderson
Twinlight out to show the Way
Wyck primed for big Aintree run
Dandino and Rock miss Vase run
Bec puzzler for Lavelle
Moore's Vino is vintage stuff
Mullins sets sights on Navan
Captain taking charge for Henderson
George plots Aintree gold rush
King out to reign in Henry VIII
Newcastle in talks over AW track
Sir champing at bit for Durkan date
Baby on board for Becher
6 December 2013Carberry sidelined for weekend
Dunaden 'back to his best'
Glance sights fixed on Cup glory
Strawbridge coy over Cloud future
Sire out to profit from Sacre blow
Queen awarded ROA honour
Three-month ban for Arnold
Contrite Butler must 'rebuild life'
Nicholls watching ground for Roque
Topper tests Future waters
Murphy hit by nine-day ban
Big field for Becher
Sacre forced out of Sandown return
Cadeaux team enjoying the ride
Lantern burning bright once more
5 December 2013Rasen survives wind scare
Festival switch for Mares' race
Sacre out of Tingle Creek
No luck for Jwala in Sprint draw
Aigles well ahead of fourth Cup bid
Rasen to check on wind
Butler considers ban response
Court team eyeing Huntingdon return
Oscar on course for Cheltenham
Cantlow in Cheltenham frame
Juddmonte "not for sale"
Noseda content with Grand journey
Cloud future hinges on Mile outcome
Road charts route towards Becher
Knight backs Somersby to shine