Rupert Gleadow has left his role as executive chef of Gravetye Manor in West Hoathly, Sussex, after seven and a half years.
In a statement, Andrew Thomason, managing director of Gravetye said: "Rupert believes this is the right time to relinquish the reigns in the kitchen and focus his attention on new challenges.
"Rupert and his partner are expecting their first child in the spring and he is relishing the opportunity to spend some time concentrating on that before hopefully realising his dream of having a little place of his own. We all at Gravetye Manor wish Rupert continued success for his future."
Gleadow was instrumental in helping the hotel, which was named AA hotel of the year 2013-14, regain its three AA rosettes.
Gravetye, has undergone a £2.5m refurbishment since the hotel was acquired in 2010 by Jeremy Hosking, co-founder of the London hedge fund Marathon Asset Management, and his wife Elizabeth. The couple were long-standing guests of the hotel. Famed for its gardens originally designed by William Robinson, the property was originally opened as a hotel in 1958 by Peter Herbert, who died late last year.