a one-man band

an organization in which one person does all the work or has all the power

Usage notes: A one-man band is a musician who performs alone and plays several instruments at the same time.

It's basically a one-man band. He designs, prints and sells the T-shirts himself. Its critics say that the company has become a one-man band in recent years.

Common Names:

Name	Pronounced	Usage
Dina (1)	DIE-nə (English)	English, Biblical Latin, Biblical Greek
Samuel	SAM-yoo-əl (English), SAM-yəl (English), sah-MWEL (Spanish), SAH-moo-el (Swedish, Finnish)	English, French, German, Dutch, Spanish, Portuguese, Polish, Czech, Slovak, Swedish, Norwegian, Dani
Paule	-	French
Danka	-	Serbian, Slovak, Polish
Stern	[stə:n]
Dodson	['dɔdsn]