Keiichiro Koyama

Upon entering Johnny's Entertainment on 21 January 2001, Koyama started out with the unit B.A.D. which stands for Beautiful American Dream. His second unit as a junior was B.B.D. which at first stood for Bad Boys Dancing, but was later changed to Best Beat Dancing. In October 2001, he was chosen as a member of Domoto Koichi's project, J-Support, alongside future fellow NEWS members Hironori Kusano and Shigeaki Kato. It was in this unit that Koyama started out as an announcer for shows such as the Ya-Ya-yah Show, and this has carried through to NEWS.

He is the oldest member of NEWS, which debuted in September 2003, and is often seen as the mother figure of the group.

From 2006 until March 2011, he hosted NHK's popular TV variety show Shounen Club (Boys Club) alongside KAT-TUN member Nakamaru Yuichi. The pair shared the screen 6 years later in Fuji TV's variety special program "Otasuke JAPAN", which aired on 14 June 2017.

He could be seen as a newscaster on NTV's "News Every", from 2010 until 2018.

Koyama learned sign language to interact with hearing-impaired children when he hosted NTV's "24 Hour TV" telethon in 2009, obtaining a test level 4.

He also occasionally participated in dramas, such as Fuji TV "Ns' Aoi" and "0-gōshitsu no kyaku", as well as guest starring in his bandmate Yamashita Tomohisa's drama Kurosagi.

Koyama opened a personal Twitter on 17 March 2023, and an official website on 22 February 2024.