Mr. Carpenter's architectural design work includes the facade of the new 7 World Trade Center tower in New York and the renovation of the Israel Museum in Jerusalem, completed in 2010.

WSJ: Robert Zimmer | Where Theory and Practice Make Perfect | Cultural Conversation by Joel Henning

Part of the pleasure of the design of Mailbox (and why it works so well) is that this not just a facade on top of the underlying Gmail service, but an aggressive reshaping of it.

FORBES: Mailbox App Revolutionizes Gmail Productivity, Will Google (Or Apple) Buy It?