My Manhattan Project

How I helped build the bomb that blew up Wall Street

I have been called the devil by strangers and “the Facilitator” by friends. It’s not uncommon for people, when I tell them what I used to do, to ask if I feel guilty. I do, somewhat, and it nags at me. When I put it out of mind, it inevitably resurfaces, like a shipwreck at low tide. It’s been eight years since I compiled a program, but the last one lived on, becoming the industry standard that seeded itself into every investment bank in the world.

I wrote the software that turned mortgages into bonds....