MENLO PARK, Calif. — Many people cite Albert Einstein’s aphorism “Everything should be made as simple as possible, but no simpler.” Only a handful, however, have had the opportunity to discuss the concept with the physicist over breakfast.

One of those is Peter G. Neumann, now an 80-year-old computer scientist at SRI International, a pioneering engineering research laboratory here.

As an applied-mathematics student at Harvard, Dr. Neumann had a two-hour breakfast with Einstein on Nov. 8, 1952. What the young math student took away was a deeply held philosophy of design that has remained with him for six decades and has been his governing principle of computing and computer security.

For many of those years, Dr. Neumann (pronounced NOY-man) has remained a voice in the wilderness, tirelessly pointing out that the computer industry has a penchant for repeating the mistakes of the past. He has long been one of the nation’s leading specialists in computer security, and early on he predicted that the security flaws that have accompanied the pell-mell explosion of the computer and Internet industries would have disastrous consequences.