IDEO's CEO Tim Brown:

Here’s what I’m saying: Although my unplanned career path turned out fine, choosing to go wide versus deep should be made consciously, not accidentally. Each path offers tremendous reward if followed with passion and commitment, but each requires different skills and approaches to be successful.

Going deep requires incredible focus, lifelong commitment to a single cause, a willingness to be patient towards achieving success, and the confidence to follow a path others may not understand or value. Whether it’s as a research scientist, designer, chef or software engineer, committing to a single discipline and pushing it as far as you possibly can holds the potential to make a significant dent on the planet.

Going wide, on the other hand, is about making connections between what you already know and what you’re curious about discovering. It requires systems thinking in order for the whole to be greater than the sum of the parts. It means developing the skills to collaborate for the purpose of learning. It’s about seeing the creative possibilities in breaking down boundaries and describing the world, your organization, the problem in new ways. It probably means having a difficult time describing to your parents what you do.

I can relate to Brown's career, mine has also been decidedly (and purposely) wide.