Sienna Mercer grew up in Toronto, Canada. As an only child, she always wanted a brother or sister and especially liked the idea of having a twin. Sadly, she never got that sister so, when she was grown up, she did the next best thing—she wrote books about a girl who reminded her of herself, and gave her the most fun, fabulous twin she could think of!
Sienna began writing stories when she was a teenager and she has not stopped writing since. She used to write in red leather notebooks while sitting on her bed, but now does most of her writing in her attic, which is quite dark, and has spooky cobwebs in the corners—the perfect location for thinking about vampires.
Sienna got the idea for 'My Sister the Vampire' from a daydream she had: what if she had a super-cool twin sister...who was a vampire? She loved the characters—and their kooky friends and family—so much, that she just had to keep writing about them.
Apart from her writing, Sienna enjoys travelling and exploring new cities, and keeps a detailed scrapbook of everywhere she’s visited. She lives in Toronto, kept company by Calypso and Angel, her two gorgeous cats.