In his 25 years in business, Steven Rambam has worked on some high-profile cases, including tracking down Nazi war criminals in Canada. He also owns PallTech, an investigative database service with more than 25 billion records on US citizens and businesses.

What do you do as a private investigator?

We are not the traditional Rockford or Magnum, P.I. type of investigator. We'll do very difficult missing persons cases, a lot of sophisticated financial fraud work, a lot of insurance company work, a lot of disappearances.

What's in your PallTech databases?

We have pretty much every American's name, address, date of birth, Social Security number, telephone number, personal relationships, businesses, motor vehicles, driver's licenses, bankruptcies, liens, judgments -- I could go on and on.

Who has access to your data?

This is a database that's restricted to law enforcement, private investigators, security directors of companies and people who have a genuine need.

How do you safeguard it?

The most restrictive rule is my own personal ethics. In 20 years, we haven't had a single lawsuit or complaint.

What has changed in the past few decades?

Two things. The first is computing power. I have in my office storage and databases and artificial intelligence scripts and behind-the-scenes links that are far more powerful and comprehensive than J. Edgar Hoover's wildest dreams.

The other thing is the mind-boggling level of self-contributed data. The average person now willingly puts on the Internet personal information about himself that 20 years ago people would hire an investigator to try and get. It's extraordinary. If you know how to use the Internet, 75 percent of an investigation can be conducted sitting in your pajamas.

Do you see this as a bad thing?

On the contrary, there are good reasons for most of this to be out there. It's not out there because these are nefarious, evil people trying to be the new Big Brother. It's because this is truly a new engine of capitalism. Where it gets a little creepy is when they aggregate all of this data together and have an extraordinary profile of you.