Daisuke Hiyama is a Japanese manga artist born in 1983 in Tochigi Prefecture, Japan. He is best known as the creator of the fantasy comedy manga series Peter Grill and the Philosopher's Time. Hiyama works primarily in the seinen demographic, which targets young adult men, and his bibliography includes numerous contributions to comedy and erotic comedy anthologies dating back to the late 2000s.

Hiyama began his professional manga career in the mid-2000s, with early works appearing as early as 2007. His bibliography includes a variety of titles such as Jingai no Yome to Ichaicha Suru: Anthology Comic, Senjou no Mahou Tsukai, and Goblin ni Eroikoto Sarechau Anthology Comic, among others. Prior to creating Peter Grill, he produced a short story version of the concept for an anthology, which was later noticed by an editor at Futabasha and developed into a full series.

The creation of Peter Grill and the Philosopher's Time was inspired by Hiyama's childhood interest in the horse racing and breeding video game Derby Stallion. He conceptualized the role of a stud horse and applied it to a harem manga scenario, imagining that if the protagonist had superior genetics like a superhero, women would naturally pursue him. The series began serialization in Futabasha's Monthly Action magazine on August 25, 2017. It later transferred to the Web Action manga website and concluded on August 27, 2024. The series has been compiled into fifteen tankobon volumes and is licensed in North America by Seven Seas Entertainment.

The manga was adapted into an anime television series. The first season, Peter Grill and the Philosopher's Time, was produced by Studio Wolfsbane and aired from July to September 2020. A second season, Peter Grill and the Philosopher's Time Super Extra, was co-produced by Wolfsbane and Studio Seven and aired from October to December 2022. Hiyama was involved in the adaptation process, checking all scripts, concept art, and storyboards. He requested adjustments regarding character dialogue and ensuring that certain characters were not portrayed as too pitiable. He also visited the recording studio and expressed satisfaction with the final animated product, noting the appeal of the characters and the voice acting performances.

Hiyama has stated that he places emphasis on creating characters that are entertaining to watch and focuses on the protagonist's futile yet comedic struggles. He aims to keep the world of his story peaceful, without true villains, despite the presence of foolish or self-serving characters. In terms of comedy, he tends to over-exaggerate situations rather than underplay them and believes that analyzing humor from other media helps in crafting comedic moments. His approach to manga paneling prioritizes clarity and pacing for the reader, using larger panels for emotional changes, camera shifts, or scene changes, and smaller panels for more static or dialogue-driven moments.

Hiyama cites Kochira Katsushika-ku Kameari Koen Mae Hashutsujo, a long-running manga he has read since childhood, as his primary influence, particularly regarding paneling and layout rather than artistic style. He works primarily at night, typically eight to twelve hours per day, with the assistance of two assistants who help with backgrounds and final image assembly. His creative process involves first organizing the plot and dialogue as a text document, then creating panel layouts on paper before switching to digital tools, specifically Clip Studio Paint on a graphics tablet with a display.