Stephen McDannell Hillenburg (August 21, 1961 – November 26, 2018) was an American animator, writer, producer, director, and marine science educator. He is known for creating the Nickelodeon animated television series SpongeBob SquarePants, on which he served as the showrunner for the first three seasons of the show, and which has become the fifth-longest-running American animated series.

Born in Lawton, Oklahoma and raised in Anaheim, California, Hillenburg became fascinated with the ocean as a child and developed an interest in art. He started his professional career in 1984, instructing marine biology at the Orange County Marine Institute, where he wrote The Intertidal Zone, an informative picture book about tide-pool animals, which he used to educate his students. In 1989, two years after leaving teaching, he enrolled at the California Institute of the Arts to pursue a career in animation. He was later offered a job on the Nickelodeon animated television series Rocko's Modern Life (1993–1996) after his success with The Green Beret and Wormholes (both 1992), short films that he made while studying animation.

In 1994, Hillenburg began developing The Intertidal Zone characters and concepts for what became SpongeBob SquarePants, which has aired continuously since 1999. He also directed The SpongeBob SquarePants Movie (2004), which he originally intended to be the series finale. He then resigned as showrunner, but Nickelodeon continued to produce more episodes after he left the series. He resumed making short films with Hollywood Blvd., USA in 2013 but was credited as an executive producer for SpongeBob SquarePants. He co-wrote the story for the second film adaptation of the series, The SpongeBob Movie: Sponge Out of Water, released in 2015.

Besides his two Emmy Awards and six Annie Awards for SpongeBob SquarePants, Hillenburg also received other recognition, such as an accolade from Heal the Bay for his efforts in elevating marine life awareness and the Television Animation Award from the National Cartoonists Society. Hillenburg announced he was diagnosed with amyotrophic lateral sclerosis (ALS) in 2017 but stated he would continue working on SpongeBob SquarePants as long as possible. He died from the disease on November 26, 2018, at the age of 57.