Rod Marsh has decided to leave his job as director of English cricket's National Academy on 30 September 2005 after four years in charge.
The former Australia wicket-keeper said: "It's time my wife and I went back to Australia to spend time with our new grandchildren.
"I have no idea what I will do. I suspect I will continue to work in cricket but not on a full-time basis."
Marsh brought a hard-nosed rigorous approach to coaching future prospects.
Hugh Morris, England and Wales Cricket Board Performance Director, said: "Cricket in England and Wales has benefited from him enormously.
"I thank him for his considerable efforts in setting up the National Academy system and for ensuring a successful beginning to the new National Academy centre at Loughborough.
"His previous experience in Australia and India has been invaluable and he has worked hard to develop crucial links with all the county coaches."
The ECB will now begin the process for seeking a replacement - and they have already said they want someone "with a status and profile in the game."
Marsh said: "I have enjoyed every moment of my time at the ECB.
"When I took the position in October 2001 I made the statement that people had to be patient about the future of English cricket.
"Miracles don't happen overnight. The England team is now in a position whereby it can command respect from all opposition and I would expect that position to remain if not improve over the next few years."
Seven of the England Test match squad of 14 currently touring South Africa have passed through the academy.