A person that employs any means of high-impact marketing tactics informally known as "sign spinning". Sign spinners twirl, toss, and perform acrobatic style feats all while still ensuring the board's message displays prominently!
The person that stands in front of businesses and on street corners that hold up signs and toss them around, points, wiggles, wears or otherwise performs with them. Some are artists with hours of practice and many tricks and are very performing. They can be called a "Spinzist"!