Even more prolific than BarkerC by SheahanJ

"Never write more than one novel in a year," his publishers told him. "You'll dilute your brand and eventually become the punch line to jokes about authors who write too much." So, beginning in 1977, Stephen King began using a pseudonym for some of his excess production, which would include the novels The Long Walk and The Running Man. What was the pseudonym?

What composer is credited with writing between 104 and 108 symphonies (depending on how you count) before his retirement in 1803-- making him, by some measures, the most prolific symphonist in the classical canon?

The original run of what series saw 62 novels published in the space of just five years, beginning with 1992's Welcome to the Dead House and ending with 1997's Monster Blood IV?

In the 1930s and 40s, before his career took the turn for which he is best known today, this writer was believed to be the world's most prolific author of pulp fiction, churning out an estimated 100,000 words per month in works such as "Dead Men Kill," "He Didn't Like Cats," and "Cargo of Coffins." (One of his later works, published in 1982, would eventually become the source for possibly the worst-reviewed movie ever made).

In 1983, she set a Guinness World Record by publishing 23 novels in a single year-- not bad for somebody who was 84 at time (and who would go on writing for another 16 years). Name this Englishwoman, whose bestsellers were mostly in the genre of Victorian-era romance.

In 2015, USA Today recognized this comedian, formerly of NBC's The Office, and currently of an eponymous Hulu series, as the world's most prolific celebrity tweeter, with over 12,000 tweets.

What artist, who died in 1973, is ranked by the Guinness Book as the most prolific in history, with over 13,000 paintings, 300 sculptures, and 100,000 prints produced over the course of a 75-year career?

American author Eleanor Robertson is credited with over 120 novels that have reached the New York Times bestseller list, some of which were written under the secondary pen names of J.D. Robb, Jill March, and Sarah Hardesty. What is, by far, Robertson's best known pen name?

The output of this Russian-American polymath, numbering over 500 volumes, is notable for spanning 9 out of the 10 major categories of the Dewey Decimal System. (His one miss: philosophy)

What recent Nobel Prize winner's best-known work, Aunt Julia and the Scriptwriter, tells the story of a hyper-prolific creator of radio soap operas?

Considered the most prolific scientist of all time, this mathematician's output was so prolific that the St. Petersburg Academy was still publishing its backlog of original papers by him in 1813-- thirty years after his death.

He was already a prolific author in his own right, penning works under the pseudonyms of Arthur Winfield, Victor Appleton, and Laura Lee Hope, when he discovered that he could increase his production exponentially by hiring ghostwriters to write his books for him. Name this creator of an eponymous syndicate, which would later also include books written under the names of Franklin W. Dixon and Carolyn Keene.