From Life After PowerPoint: Prezi Zooms Ahead in Digital Storytelling:

Prezi co-founder and CEO Peter Arvai, on the roof deck of the company's San Francisco office building.
Prezi co-founder and CEO Peter Arvai, on the roof deck of the company’s San Francisco office building.

Prezi co-founder and CEO Peter Arvai, on the roof deck of the company’s San Francisco office building. Photo by Wade Roush.