Marissa Mayer's burden
I worked for Google as a software engineer from 2003 to 2008. I never worked directly with Marissa Mayer (and I didn't know her socially either), but I saw enough to know that she was very driven and had a firm vision of what she wanted, worked out in the finest detail. She stuck to her guns. Her genius, like Steve Jobs', was in managing the interface between computers and those difficult-to-fathom humans, making the tech as user-friendly and seamless as possible.