In 2006, Google CEO Dr. Eric Schmidt joined Apple's board of directors. Google and Apple collaborated on the iPhone's mapping services, and a year later, Schmidt joined Jobs on stage during the iPhone's introduction at Macworld Expo. The two men were all smiles and compliments, and the venture looked bright.
After the iPhone's release in the US, both companies went about their business, both collaboratively and independently. While Apple worked on solidifying a foothold in the global smartphone market, Google continued development on Android and the Chrome OS -- both competitors to Apple's iPhone and OS X. Eventually, the divergent interests of Apple and Google came to a head, and Dr. Schmidt resigned from his position on Apple's board due to "...conflicts of interest."
Today, The New York Times points out, the chasm between these two men and their companies is deep and personal. At a recent town hall-style employee meeting, Jobs had harsh words for his former collaborator:
"We did not enter the search business. They entered the phone business. Make no mistake: they want to kill the iPhone. We won't let them."