Mr Beast Investors Club Tye Dye Tshirt Blue and Black with colorful Mr Beast Graphic on left front chest and back. Mr Beast YouTube Sensation. 27 inches long from shoulder to waist #mrbeast James Stephen "Jimmy" Donaldson better known by his online alias MrBeast, is an American YouTuber, internet personality, and businessman. He is known for his fast-paced and high-production videos featuring elaborate challenges and lucrative giveaways. With over 330 million subscribers, he has the most subscribers of any YouTube channel