I thought my life was mapped out. Research, living in the forest, teaching and writing. But in '86 I went to a conference and realised the chimpanzees were disappearing. I had worldwide recognition and a gift of communication. I had to use them.
If you're happy, that's probably the most important thing. Everyone probably has their own definition of success, for me it's happiness. Do I enjoy what I'm doing? Do I enjoy the people I'm with? Do I enjoy my life?