Real name: Dennis Lynds. Beginning in 1968 with The Mystery of the Moaning Cave and ending in 1989 with Hot Wheels, Dennis Lynds wrote fourteen novels under the pen name William Arden for the juvenile detective series The Three Investigators, which was originated by Robert Arthur, Jr.. Under this same name, he also wrote five novels featuring private eye Kane Jackson, a former military policeman who has become an industrial security specialist after leaving the military. The first Jackson novel, A Dark Power, appeared in 1968. As Arden, Lynds also wrote the highly-regarded espionage short story, "Success of a Mission," which was a finalist for the 1968 Edgar Award for best short fiction.

Lerangis' work includes The Viper's Nest and The Sword Thief, two titles in the children's-book series The 39 Clues, the historical novel Smiler's Bones, the YA dark comedy-adventure novel wtf, the Drama Club series, the Spy X series, the Watchers series, the Abracadabra series, and the Antarctica two-book adventure, as well ghostwriting for series such as the Three Investigators, the Hardy Boys Casefiles, Sweet Valley Twins, and more than forty books in the series The Baby-sitters Club and its various spin-offs.[1] He has also written novels based on film screenplays, including The Sixth Sense, Sleepy Hollow, and Beauty and the Beast, and five video game novelizations in the Worlds of Power series created by Seth Godin.[2] As a ghostwriter he has been published under the name A. L. Singer.[3] Lerangis is the son of a retired New York Telephone Company employee and a retired public-elementary-school secretary, who raised him in Freeport, New York on Long Island. He graduated from Harvard University with a degree in biochemistry, while acting in musicals[4] and singing with and musically directing the a cappella group the Harvard Krokodiloes,[5][6] before moving to New York. He worked there as an actor[7] and freelance copy editor for eight years before becoming an author.[8] In 2003, Lerangis was chosen by First Lady Laura Bush to accompany her to the first Russian Book Festival, hosted by Russian First Lady Lyudmila Putina in Moscow.[9][10]Authors R. L. Stine (Goosebumps) and Marc Brown (the Arthur the Aardvark series) also made the trip with Bush.[9] Also in 2003, Lerangis was commissioned by the United Kingdom branch of Scholastic to write X-Isle, one of four books that would relaunch the Point Horror series there.[11] A sequel, Return to X-Isle, was published in 2004. In 2007, Scholastic announced the launch of a new historical mystery series called The 39 Clues, intended to become a franchise.[12] Lerangis wrote the third book in the series, The Sword Thief, published in March 2009.[13][14][15] On March 3, 2009, Scholastic announced that Lerangis would write the seventh book in the series, The Viper's Nest.[14][16] Lerangis lives in New York City with his wife, musician Tina deVaron, and their sons Nick and Joe.[17]

Megan Stine is the Editor-in-Chief of Real U Guides and the author of more than 100 books for young readers including Trauma-Rama, an etiquette book for teenagers published by Seventeen magazine, and several titles in a series based on the popular 1990’s television series Party of Five. A frequent writer of books in the enormously popular Mary-Kate and Ashley series, she is the best-selling author of Likes Me, Likes Me Not and Instant Boyfriend. She has worked with CBS and ABC in developing comedy and drama television pilots, and has written comedy material for a well-known radio personality in New York. When she isn’t writing, she is a portrait and fine art photographer and a contributing photographer for the Real U series of guides.