Tom Glick has been appointed as Manchester City's chief commercial and operating officer to replace Gary Cook who left earlier in the year.
The current CEO at Derby commenting on the appointment said:
"It has been an honour to be associated with such a famous club.
"My family and I have been warmly looked after by the people of Derby and we shall always have this city and the Rams close to our hearts."
Rams club chairman Andy Appleby added: "The club's strategy moving forward has clearly been set and it is testament to the planning, structures and people already at the club that I and the rest of the board will now take the appropriate time to find the right candidate to become the next chief executive."