Kathmandu chief executive Xavier Simonet has resigned after five and a half years at the company.
Simonet, who intends working out a six-month notice period, is leaving to take up a senior role with the Australian Public Service.
"We are disappointed to lose Xavier," Kathmandu chairman David Kirk said. "We wish him well in the important work he will undertake."
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Simonet led Kathmandu Holdings through a period of growth and re-positioning of the company, Kirk added.