Fetching details from the dictionary...

engaging in (work); pursuing (e.g. studies); following (a profession); being involved in
彼は二十年以上医療現場に従事してきた。
He has been working in the medical field for over 20 years.
農業に従事する若者が年々減少している。
The number of young people engaged in agriculture is decreasing year by year.
彼女は環境保護活動に長年従事していた。
She has been engaged in environmental protection activities for many years.