Sam Gerstenzang

It's pronounced Ger-sten-zang.

I'm a co-founder of Umbrella, a membership service for people 65+.

Most recently I was a Principal at Sidewalk Labs, investing and building urban-focused companies. Before that, I ran the product, design and data teams at Imgur, and was a member of the investment team at a16z. I've held various engineering and product roles and graduated from Stanford.

Read my tweets, essays or more on what I've done professionally.

I think about augmented cognition, cities, software and economic development, lemons, collective intelligence and communities, organizational structure, and well-crafted furniture.

I'd love to hear from you.

My email address is my first and last name at