Christian Robinson signing copies of Josephine at the Chronicle booth.

Author Lindsay Mattick (in white) and illustrator Sophie Blackall (in red) resume autographing Finding Winnie after a Starbucks run, at the Little, Brown booth.

Jerry Pinkney was all smiles at the Little, Brown booth.

Jon Klassen charmed his fans at the Candlewick booth!

Kevin Henkes and his wife, illustrator Laura Dronzek, engaged with many enthusiasts of When Spring Comes at the HarperCollins booth.

Kimberly Brubaker Bradley jotting a message on a copy of The War That Saved My Life at the Children's Plus booth.

Lane Smith (left) and Jory John (right) team up on personalizing copies of their Penguin Problems at the Random House booth.

The author-illustrator team of Carole Boston Weatherford and Jeffrey Boston Weatherford penning notes in copies of You Can Fly at the S.& S. booth.

Laurie Halse Anderson was committed to greeting as many of her readers as possible at the Penguin booth.

Lois Ehlert was indefatigable, signing copy after copy of Rain Fish at the S.& S. booth.

Sergio Ruzzier, intent on getting his message inside a copy of Two Mice just right, at the Houghton Mifflin Harcourt booth.

Sona Charaipotra (left) and Dhonielle Clayton (right) drew a crowd signing Shiny Broken Pieces at the HarperCollins booth.