In early 1961, my then-editor at Doubleday, Timothy Seldes, told me he had received a request from a foreign publisher to reprint the Foundation books. Since they were not Doubleday books, he passed the request on to me.

I shrugged my shoulders. "Not interested, Tim. I don't get royalties on those books."

Seldes was horrified, and instantly set about getting the rights to the books from Gnome Press (which was, by that time, moribund) and in August of that year, the books (along with I, Robot) became Doubleday property.

From that moment on, the Foundation series took off and began to earn increasing royalties. Doubleday published the Trilogy in a single volume and distributed them through the Science Fiction Book Club. Because of that the Foundation series became enormously well-known.

In the 1966 World Science Fiction Convention, held in Cleveland, the fans were asked to vote on a category of "The Best All-Time Series." It was the first time (and, so far, the last) the category had been included in the nominations for the Hugo Award. The Foundation Trilogy won the award, which further added to the popularity of the series.

Increasingly, fans kept asking me to continue the series. I was polite but I kept refusing. Still, it fascinated me that people who had not yet been born when the series was begun had managed to become caught up in it.

Doubleday, however, took the demands far more seriously than I did. They had humored me for twenty years but as the demands kept growing in intensity and number, they finally lost patience. In 1981, they told me that I simply had to write another Foundation novel and, in order to sugar-coat the demand, offered me a contract at ten times my usual advance.

Nervously, I agreed. It had been thirty-two years since I had written a Foundation story and now I was instructed to write one 140,000 words long, twice that of any of the earlier volumes and nearly three times as long as any previous individual story. I re-read The Foundation Trilogy and, taking a deep breath, dived into the task.