Richard Russell, 91, who shared his technical analysis on investing with subscribers through the influential Dow Theory Letters since 1958, has died.

He died Nov. 21 at his home in La Jolla, Calif., his family said.

He had entered a hospital a week earlier and was diagnosed with clots in his leg and lungs.

An adherent of the investing principles of Charles Dow, founder of the Wall Street Journal, Mr. Russell published his newsletter continuously from 1958, never missing an issue in more than half a century.

In his last column, published Nov. 16, Mr. Russell wrote: "I read 10 newspapers a day, but the news is getting increasingly difficult to digest down to something understandable, and the vast array of news sources becomes more and more complex. I can only imagine what the newspapers will look like in 10 years."

Stock analyst Robert Prechter wrote in 1997: "Russell has made many exceptional market calls. He recommended gold stocks in 1960, called the top of the great bull market in stocks in 1966 and announced the end of the great bear market in December 1974."

- Bloomberg News