Isn't there a difference between "who's" and "whose"?

OCCASIONAL RANT NO. 5:

The Times of India Crest Edition of June 30 features an interview with poet and author Jeet Thayil by Naomi Canton. Here's the paragraph I have a problem with:

"Sipping a glass of red wine in a French cafe amidst Oxford's dreaming spires where the production toured this week, the 52-year-old, who's first novel Narcopolis explores the drugs-filled underbelly of 1970s Mumbai, says: 'Don't these subjects interest you? They are in my top ten topics to write about, yes.' "

Doesn't anyone at the Times know the difference between "who's" and "whose"? How is it the subs did not catch the typo?

And while I am on the subject, why use "amidst" when "amid" will do?