He was assigned to the planning department of Asahi Geino, entertainment, magazine, where he was responsible for the manga coverage page.

In 1973, he became the editor of the magazine's supplement Comic & Comic (コミック&コミック, komiku & komiku), for which he worked with and befriended film directors, such as Sadao Nakajima, Eiichi Kudo and Teruo Ishii, as well as animators and manga artists, like Osamu Tezuka, George Akiyama, Kazuo Kamimura, Hōsei Hasegawa [ja] and Shotaro Ishinomori.

During a hiatus of the comic supplement he was reassigned to the performing arts feature section of Asahi Geino, for which he covered such varied topics as Bōsōzoku, Japanese motorcycle gangs, and the bombing of the headquarters of Mitsubishi Heavy Industries by the East Asia Anti-Japan Armed Front.

In July 1981 Suzuki unsuccessfully pitched Miyazaki's original idea for an animated story, Warring States Demon Castle (戦国魔城, Sengoku ma-jō).

In 1986, Suzuki served on the production committee for the Studio Ghibli film Laputa: Castle in the Sky for Tokuma Shoten, released in August, and he succeeded Ogata as Animage editor-in-chief in October.

[5] Suzuki was in charge of the Ocean Waves project, directed by Tomomi Mochizuki, created by Studio Ghibli for television, which aired in Japan in 1993.

In 1995 Suzuki also became the producer on the next feature length Ghibli film project, released, in 1997, under the title he had selected, Princess Mononoke.

In 2002 director Hiroyuki Morita’s The Cat Returns and Ghiblies episode 2, directed by Yoshiyuki Momose, had their theatrical release.

Suzuki assumed the role of producer for Innocence directed by Mamoru Oshii, which was released in Japanese theatres in March 2004.

[10] However, he has continued to assist with other projects, including acting as a co-producer for The Red Turtle (2016), and lead producer for Earwig and the Witch (2020) and The Boy and the Heron (2023).

Suzuki has been recognized by the Academy of Motion Picture Arts and Sciences for the following accolades as a producer: In 2014, at the 64th Annual MEXT Art Encouragement Prizes Toshio Suzuki was awarded the Grand Prize for his involvement as producer in The Wind Rises and The Tale of the Princess Kaguya.