Dr Harrison said leading Ararat Rural City Council had been a privilege.
"It has been an honour to serve the Ararat community in this role," he said.
"I am proud of what the organisation has achieved. The infrastructure we have built and the long-term plans we have put in place will benefit this community well into the future.
"I leave with enormous respect and gratitude for the Councillors I have worked alongside, the dedicated staff across the organisation, and the Ararat community itself. This is a community that cares deeply about its future, and I am confident it is in good hands."
Mayor Bob Sanders said Dr Harrison's contribution to Ararat had been significant and lasting. "Dr Harrison has been a thoughtful and principled leader throughout his time as our CEO," he said.
"His commitment to getting the fundamentals right - our roads, drainage, community facilities, and long-term financial sustainability - has positioned Ararat Rural City Council strongly for the future.
"Tim brought a rigorous, considered approach to everything he did. The infrastructure and plans he leaves behind will serve this community for decades to come, and for that we are genuinely grateful.”
Dr Harrison departs the organisation on strong financial footing – the adopted 2026-2027 Budget projects an operating surplus of $4.624-million.
Council will confirm arrangements for the transition to a new chief executive in the coming months.
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