Gordon Bell has been working in the IT industry for nearly 50 years. He was a key engineer and vice president of research and development at minicomputer pioneer Digital Equipment Corp. for 23 years and later a founder of the Computer History Museum. Today Bell is a principal researcher at Microsoft.

The project most captivating Bell now is his work on finding ways for anyone to capture memories of their lifetime on a computer. The nine-year project, called MyLifeBits, has Bell searching through his own memory to collect as much information -- pictures, phone calls, e-mails and conversations -- as he can about his life. He's trying to store a lifetime on his laptop.

In an interview with Computerworld, Bell talked about his favorite computer of all time, the state of telepresence and what he wishes people knew about his good friend and Microsoft research colleague Jim Gray who was lost at sea last year.

What has been the most influential change or product that you've seen over the years?

Certainly, the big bang was the integrated circuit and the microprocessor. [Since] that hit in 1972 with the first microprocessor, we've been on this long-running exponential, Moore's Law. Everything has been pretty predictable since then. It was really the integrated circuit that allowed the exponential increase in power.

What did you think we'd have by now but don't?

I started out in speech when I graduated from MIT. I thought we would be a little further ahead in being able to do speech recognition. Speech in particular has been a hard one.

What's the one computer that best illustrates the 20th century?

When you take it all together, it's either the [IBM 360 mainframe] or the PC. [The mainframe] was the workhorse of computers for such a long time and continues to be. On the other hand, the thing that's had the biggest impact has been the PC. The world population of PCs is in the billions. With the sheer numbers and the number of people's lives it's touched, it's probably got to be the PC.

What has been your favorite computer of all time?

For one that I was involved with, the VAX was the most successful. It was a joy to be involved with. It was a wonderful team. I'm very proud of what we produced. And for one that I wasn't with, in a funny way it's probably the IBM 360. I love Seymour Cray's computers. I'd say it's the vector processor. The Cray style of vector processor is one of the great inventions. It's certainly underappreciated by most scientists. It just computes very fast. It was the workhorse for computing for, really, two decades. It was the workhorse from '75 to '95. It had a wonderful elegance to it and the way it works. It really was a spectacular piece of engineering.

What was the best thing about your work on VAX computers?

To me, the most exciting time was when I was in Tahiti and wrote a paper that turned out to be the VAX strategy. It was a commitment to having a small number of computers that would cover the whole of computing, from personal computing and workstations up through mainframes and central computers. That we did with clusters. It was the idea of using computers in a cluster that really was the big thing about VAX.

What was the most frustrating or disappointing part of it?

I ended up with a bypass -- a heart attack that I can't blame on VAX or the difficulty. It was certainly a lot of stress to get all of the machines built and get things done. There was a bittersweet joy to it. After you get all of it out there, you kind of forget any of the difficulties that you had in getting it done. I tend to forget those things.