R. M. Romero lives with her family and a menagerie of pets in Colorado.

The Dollmaker of Kraków is her debut middle-grade novel.

Kimberly Brubaker Bradley has written several historical novels for children and young adults, including the bestselling Newbery Honor Book The War that Saved My Life.

She lives on a farm in Tennessee with her family.

Nancy Holder is the nationally bestselling author of forty-two novels and two hundred science fiction, fantasy and horror short stories.

She has received four Bram Stoker Awards from the Horror Writers Association, and her latest novel, Ghost Roads, appeared on the USA Today Bestseller list.

Her work has been translated into more than two dozen languages. She has spoken at World Fantasy conventions, and at World Horror conventions, among others.

She currently lives in San Diego with her husband Wayne, her daughter Belle, and their three dogs, Mr. Ron, Maggie, and Dot.

Alan Katz is the author of many highly acclaimed children's books, including Take Me Out of the Bathtub and Other Silly Dilly Songs, Don't Say That Word! OOPS!, Poems I Wrote When No One Was Looking, and The Day the Mustache Took Over and its sequel, The Day the Mustache Came Back. Alan is also a six-time Emmy-nominated writer for TV series including The Rosie O'Donnell Show, animated series Taz-Mania, Disney's Raw Toonage and Goof Troop, the Grammy Awards and Tony Awards, and many network specials and game shows. he has also created comic books, trading card sets, web videos, TV commercials and hundreds of other special projects for kids and parents. He lives with his family in Fairfield County, Connecticut.

Joanne Levy is the author of a number of books for young people, including Crushing It and Small Medium At Large. She lives in Clinton, Ontario, with her husband and kids of the furred and feathered variety.

Erica S. Perl is the author of several books for young readers, including Dotty, Chicken Bedtime Is Really Early and the well-loved Chicken Butt! books. Erica lives in Washington D.C. with her family.

Terri Libenson is the cartoonist of the internationally syndicated comic strip, The Pajama Diaries.

She is also an award-winning humorous card writer for American Greetings Corp. Like Emmie in Invisible Emmie, Terri grew up shy and artistic in Wilkes-Barre, Pennsylvania.

She now lives a more outgoing life with her husband and two daughters in Cleveland, Ohio.