Who was the person and/or agency that lead the design work for the iPod?

Hello petterk-ga,

Thank-you for your question.

The person who lead the design work for the Apple iPod was Jonathan Ive.

"Jonathan Ive, inventor of the iPod music player and the iMac computer."
http://www.telegraph.co.uk/news/main.jhtml?xml=/news/2005/11/19/nive19.xml&sSheet=/news/2005/11/19/ixnewstop.html

"Jonathan Ive is the chief designer of Apple's iPod media players."
http://news.digitaltrends.com/article9190.html

"Author JK Rowling and Ricky Gervais have been beaten by the designer
of the iPod to be named the most influential person on British
culture.  Jonathan Ive, who designed the pocket-sized music player,
beat the Harry Potter writer into second place."
http://news.bbc.co.uk/1/hi/entertainment/arts/3481599.stm

"The winner of the Design Museum's inaugural Designer of the Year
award in 2003 was JONATHAN IVE (1967-), senior vice-president of
design at Apple whose innovations include the iPod and iMac."
http://www.designmuseum.org/design/index.php?id=63

A short biography of Ive:
http://en.wikipedia.org/wiki/Jonathan_Ive

If you require any further assistance on this matter please do not
hesitate to ask for clarification.