After stints as a Kyodo News reporter at locations such as Maebashi, Sendai and Sapporo as well as in the Foreign News Section at the head office, he served as Phnom Penh bureau chief and was assigned as a video and news desk journalist at the Tokyo MX television station. He is currently an editor of audio-video news at the head office. Tatsumi has written many newspaper and magazine news articles, including photo-illustrated overseas reportage, and he has also produced many video reports. Tatsumi has completed over 40 full marathons. He continues to run in marathons throughout the world, holding a compact camera in one hand and taking photographs along the way.