founder; establisher; opener
Refers to the person or entity that establishes, opens, or sets up something such as a company, institution, facility, or account. Often used in formal or business contexts.
The founder of this school is the local board of education.
The account opener themselves must carry out the procedure.
創設者 implies a more creative or pioneering founding, often used for institutions, awards, or movements, whereas 開設者 is more neutral and administrative.
Compound of 開設 (kaisetsu, 'opening, establishment') + 者 (sha, 'person'). The word is transparently derived from its components.