A portion of an Examiner interview with Shu Takumi…

E: What was it like having spent so many years on Ace Attorney and now transitioning to a brand new property like Ghost Trick?

ST: Indeed, I worked on Ace Attorney for a really long time. Actually when I finished the third game on the GBA back in 2004, I had felt I finished the story of Phoenix Wright and I felt I was ready to move on to a new project. That was when I started to think about Ghost Trick, but Capcom decided they wanted to make a fourth Ace Attorney game due to fan reaction and the great sales. So I went ahead and made the fourth game. I also helped with the DS ports for the first three games and brought them to America. It was a long time coming. I’ve been sitting and stewing on it for a while. Finally in 2007 I was able to get started on Ghost Trick.

Full interview here (Thanks GameritisGuy!)