Tammie lives in Cincinnati, Ohio with her husband Lee, and loves spending the day in her studio with her dogs Amos and Artie. She began her love of illustrating at a very young age while drawing at the kitchen table with her dad. She has fond memories of sitting for hours drawing things around the house and later presenting them as gifts to her mother. Since she was an only child, drawing became a favorite form of self-entertainment.

Tammie initially pursued a career as a professional ballet dancer before she decided to switch gears. She attended the Columbus College of Art and Design, where she received her BFA. She began her illustration career as a staff illustrator for a major greeting card company eventually becoming the director of the juvenile product line. Having discovered that illustration was her true passion, she left to begin a freelance career in the children's market where she has illustrated numerous books, posters, magazines, cds, games, clothing, and just about anything else you can think of. She has now turned to writing as well and has written her first children's book, Olive and Snowflake (Marshall Cavendish) .

Some of her most recent books include four new titles in a brand new series for emergent readers, Pedro First Grade Hero (Capstone) as well as two new additions to the popular award winning Katie Woo Series (Capstone).

Ransom has published more than 180 books for children, and she is amazed every day that she's able to do this as her life's work. It's no small thing to discover at an early age (ten!) what one is meant to do, and then pursue that dream. For her, the best part of writing for children is that she can move between writing board books, picture books, easy readers, chapter books, middle grade novels, nonfiction, and biography. She was excited to move into picture book nonfiction with BONES IN THE WHITE HOUSE: THOMAS JEFFERSON'S MAMMOTH (Doubleday, 2020) and ONLY MARGARET: A STORY ABOUT MARGARET WISE BROWN (Eerdmans, 2021). Her newest middle grade novel, JUNEBERRY BLUE, was published in 2024 by Peachtree Books.

AMANDA PANDA QUITS KINDERGARTEN and the sequel AMANDA PANDA AND THE BIGGER, BETTER BIRTHDAY (Doubleday) are her first picture books with animal characters! She is proud of her easy readers featuring a brother and sister having fun throughout the year: PUMPKIN DAY, APPLE PICKING DAY, SNOW DAY, GARDEN DAY, BEACH DAY and more. Look for the latest titles in this Level 1 series written in bouncy rhyme, plus the popular TOOTH FAIRY'S NIGHT and GO, GO, TRACTORS! (all Random House).