Educating Staff is an Investment
Mr Marks was in Adelaide earlier this year to speak to more than 100 managers and design consultants from home improvement company Australian Outdoor Living (AOL).
As chief executive of Results Seminars, Mr Marks runs personal development courses and sales "boot camps" in Scottsdale, Arizona.
He also travels the world to teach business managers about hiring, training and motivating sales teams.
"Some sales organisations just like their sales staff to make money," Mr Marks said. "We want to make sure sales staff are well educated."
AOL Managing director Colin Kuchel said he brought Mr Marks to Adelaide to inspire employees.
"I've always placed great emphasis on investing in the development of our people," he said.