Is That the Bus? (Charlesbridge, distributed by Penguin Random House), September 2024.

MARGARET WISE BROWN BOARD BOOK AWARD 2025, silver medal

“In this vehicle-heavy board book, a young boy waits for his big sister. He plays throughout the day but continually looks out the window at each new noise. “Is that the bus? WAAA! WOOOOO! But it’s not the bus. WAAAA! WOOOOO! The fire truck wails away.” A variety of vehicles, including a garbage truck, dump truck, and motorcycle, make appearances in this title. VERDICT The soft lines, bright palette, and sparse text make this a first purchase for libraries.
—School Library Journal

…As the day passes by, the boy plays with his toys, until finally, he hears "Eeep!... Eeep!" The boy runs outside to find the school bus, bringing his sister arrived home. They share a warm hug and spend time together playing. This special story is a beautiful depiction of sibling bonds… perfect for children aged 2-4.
—Children's Literature

“An excellent gift book for truck lovers.” Good Reads

The House Baba Built, by Ed Young with Libby Koponen (Little, Brown, 2011).

Favorably reviewed in the New York Times.

3 starred reviews.

Parents Choice Award, Gold.

Blow Out the Moon (Little, Brown, 2004).

Massachusetts Book Award, 2005

New York Public Library Best Titles for Reading and Sharing, 2004

“The word 'delightful' is over-used in reviews, but it's difficult to find one that's more appropriate...” Booklist (starred review) 

“Koponen is a gifted writer whose distinctive style has a conversational rhythm.” School Library Journal

New York Public Library Top Title for Reading and Sharing, Massachusetts Honor Book

“I have read your book Blow Out the Moon so many times, and loved it every single time! You once came to my school... I was in 4th grade at the time and now I'm going into 7th grade and still reading over and over your book!” -- a reader

Libby first published the whole book on the Web and didn't approach editors until she had a packet of emails from children and recommendations from schools and reviewers. Children's Literature called the novel “entirely refreshing” and the companion Web site “a delightful compilation.”