Apple has employed retiring executive Jonathan Rubinstein on a consultancy basis.

As Apple warned in October 2005, Rubinstein resigned his post as senior vice president of the iPod division on April 14.

A SEC filing last week confirmed Apple has reached a consulting deal with the outgoing chief, who will be available for up to one working day per week until April 16, 2007 for a fee. The deal can be terminated at any time on mutual agreement.

Rubinstein joined Apple in 1997, before which he worked at FirePower Systems, NeXT Computer and Hewlett-Packard. He is an elected member of the US National Academy of Engineering and a senior member of the IEEE.

Rubinstein's executive role is being filled by Tony Fadell, who joined the iPod engineering team in 2001 and was promoted to head of engineering for the iPod group in 2004. Fadell is known as the "father of the iPod", because he brought the concept of the product to Apple.

Reflecting on the departure of Rubinstein last October, Apple CEO Steve Jobs said: "I've worked with Jon for over 15 years, and we're going to miss him. Jon has done an excellent job as a member of Apple's senior management team, as well as building our world-class iPod engineering team and running our hardware engineering team prior to that."