Imamura entered NHK in 1983. He was the commissioning editor of the slot “World Documentary” from 2009 until 2012. Since 2012 he has been working with NHK Enterprises and is in charge of co-production, pre-buy and commission of TV programs mainly documentaries. He is one of the founders of Tokyo Docs which started in 2011. He is also the CEO of his own company called Studio IMAKEN created in 2022.
As the producer of NHK or NHK Enterprises, he co-produced many Asian documentaries such as Plane of Snail (Best feature length documentary, IDFA 2011), The Chinese Mayor (Special Jury Prize, Sundance 2015), Kabul, City in the Wind, After the Rain (2021), Organic Terrorist (TV version, 2022). He is now actively supporting Asian documentary projects as an independent executive producer or as a co-producer.