Progress is the professional alias used by Japanese voice actor Susumu Chiba for work in adult games and anime. Born on September 13, 1970, in Kanagawa Prefecture, Japan, he is affiliated with the talent management firm Osawa事务所. A graduate of Nihon University's Faculty of Economics, he began his voice acting career in 1996.

Under his primary name, Susumu Chiba, he has built an extensive career spanning numerous television anime series since the late 1990s. He is widely recognized for a range of major roles, including the Heian-era go player Fujiwara no Sai in Hikaru no Go, the shinsengumi chief Isao Kondo in Gintama, and Welkin Gunther in Valkyria Chronicles. His other notable credits include Takuma Ichijo in Vampire Knight, Chiaki Nagoya in Kamikaze Kaitō Jeanne, Eld Jinn in Attack on Titan, Castor in 07-Ghost, and Kidōmaru in Naruto. He has also appeared in long-running franchises such as Bleach, Detective Conan, and Digimon.

In the series Magical Kanan, Chiba, credited under his primary name, provided the voice for the supporting character Hazuna. His work demonstrates frequent collaborations with anime studios and production committees, often securing roles across various series, though specific directorial or creative partnerships are not consistently documented. Over his decades-long career, he has amassed a substantial filmography, contributing to more than ninety distinct projects.