It was flattering, of course, but irritating as well. Years had passed, then decades. Back in the 1940s, I had been in a Foundation-writing mood. Now I wasn't. Starting in the late 1950s, I had been in a more and more nonfiction-writing mood.

That didn't mean I was writing no fiction at all. In the 1960s and 1970s, in fact, I wrote two science-fiction novels and a mystery novel, to say nothing of well over a hundred short stories - but about eighty percent of what I wrote was nonfiction.

One of the most indefatigable nags in the matter of finishing the Foundation series was my good friend, the great science-fiction writer, Lester del Rey. He was constantly telling me I ought to finish the series and was just as constantly suggesting plot devices. He even told Larry Ashmead, then my editor at Doubleday, that if I refused to write more Foundation stories, he, Lester, would be willing to take on the task.

When Ashmead mentioned this to me in 1973, I began another Foundation novel out of sheer desperation. I called it "Lightning Rod" and managed to write fourteen pages before other tasks called me away. The fourteen pages were put away and additional years passed.

In January 1977, Cathleen Jordan, then my editor at Doubleday, suggested I do "an important book - a Foundation novel, perhaps." I said, "I'd rather do an autobiography," and I did - 640,000 words of it.

In January 1981, Doubleday apparently lost its temper. At least, Hugh O'Neill, then my editor there, said, "Betty Prashker wants to see you," and marched me into her office. She was then one of the senior editors, and a sweet and gentle person.

She wasted no time. "Isaac," she said, "you are going to write a novel for us and you are going to sign a contract to that effect."

"Betty," I said, "I am already working on a big science book for Doubleday and I have to revise the Biographical Encyclopedia for Doubleday and -"