Who is the illustrator of Biff and Chip books?

The original illustrator of the Biff, Chip, and Kipper books is Alex Brychta. He illustrated the first few books in the series, which helped to establish the iconic style of the characters.

While other illustrators have contributed to the series since then, Brychta's distinctive style is still recognizable in many of the Biff, Chip, and Kipper books.