By GREG MANSFIELD THE TASMANIAN Thoroughbred Racing Council is again looking for a new chief executive. Rohan Mitchell has resigned after a short, but eventful 18 months in the position and is returning to Victoria. His predecessor Charlotte Dickie, also recruited from Victoria, lasted only 15 months before moving to Western Australia. TTRC chairman Rod Thirkell- Johnston said that Mitchell had made "a very valuable contribution to the advancement of thoroughbred racing in Tasmania". "The many initiatives and improvements implemented during his time will continue to benefit racing well into the future," he said. "The introduction of workers' compensation for jockeys, restructuring of the TasVobis incentive scheme and improving prizemoney are among his many achievements. "The reforming of prizemoney distributions increased returns to owners and maximized turnover. "Rohan has also overseen improvements to OH&S for the industry and deserves praise for his management of the equine influenza situation." Mitchell is expected to finish up in late September. The TTRC will consider a replacement "in the coming weeks."