I think this interview conducted by Bookslut may be the most revealing interview of Jesse Ball that I have read.
Shane Jones at Hobart has an interesting interview with Jesse Ball.
Chinua Achebe was interviewed by Paris Review in 1994. As with all their interviews, I highly recommend it. There are some fascinating tidbits on the publishing of Things Fall Apart.
The Atlantic also has an excellent interview in which Mr. Achebe discusses Things Fall Apart.