Refers to the top editorial position in a publication, such as a newspaper, magazine, or journal. Often used in formal contexts.
He was appointed editor-in-chief of the newspaper company.
編集長 is a more common term for 'editor-in-chief' or 'chief editor', while 編集主幹 can sound more formal or traditional, sometimes implying a senior advisory role rather than day-to-day management.
Compound of 編集 (editing) and 主幹 (chief, head). The exact historical derivation is uncertain, but the term follows a common pattern for organizational titles.