Greshes started his business career in 1973 as a salesman in New York City's Garment Center. By the time he left in 1983, he was running a multi-million dollar manufacturing company.

From 1984 to 1986 he was V.P. of Sales & Marketing for a NYC consulting company and in that time tripled their sales.

He left in 1986 to start his own business as a professional speaker and over the last 20+ years has been a featured keynote speaker, with an expertise in sales, motivation and customer service, at thousands of corporate and association events on 3 continents.