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Hammann grew up on a farm near Bellevue, Iowa and attended Bellevue High School. He received a bachelor's degree in business administration from the University of Iowa (1981–1984), and earned his M.B.A. from the University of Wisconsin–Madison. At Iowa, he played wide receiver for Hawkeyes coach Hayden Fry.
Hammann managed the Scope and Crest brands for consumer products giant Procter & Gamble. He developed a business program for shoe marketer Famous Footwear that supported the company's plan to triple its retail presence. Hammann served as general manager of the Canadian division of battery maker Rayovac. He then was named a vice president of The Coca-Cola Company from 1996 to 2000, where he led the National Account fountain group. Hammann was chief customer officer for global apparel giant Levi Strauss & Co. from 2001 to 2003. While there, he introduced a new, down channel, $1 billion brand of Levi's to Wal-Mart stores worldwide.
Hammann joined Nautilus Corporation in 2003, replacing Brian Cook, who had held the CEO position for 17 years. Under Hammann's leadership in 2005, Nautilus launched a three-year plan to leverage its five brands, Nautilus, Bowflex, Schwinn Fitness, Stairmaster, and Pearl Izumi. Hammann resigned in August 2007. Hammann was replaced by Robert Falcone, who was named to the positions of president and chief executive. A report of Falcone's appointment noted that Nautilus had encountered financial difficulties due to increased distribution of the company's Bowflex machines and apparel lines to sports retailers just as consumer spending sharply tailed off.
In 2008, Hammann returned to his home town, Bellevue, Iowa, to coach track and football at Bellevue High. In 2009, he was named the head football coach at Beckman High School in Dyersville, Iowa. From 2008 till September 2012 he was the CEO at Power Plate International Limited, which manufactures fitness equipment and also CEO at Action Advisors.
- http://www.columbian.com/business/businessNews/2007/09/09222007news201596.cfm[dead link]
- "Ex-Hawk, CEO takes charge at Beckman: Bellevue's accomplished Hammann aspires to guide Blazers' football program to state prominence. Archived 2010-10-04 at the Wayback Machine., Dubuque Telegraph Herald, May 14, 2009.
- "The Nautilus Group Announces Gregg Hammann as President and Chief Executive Officer; Reaffirms Commitment to Core Commercial and Retail Channels", Business Wire, July 22, 2003.
- Kristina Shevory, "Nautilus hires Levi Strauss exec to pump up its profits and sales", Seattle Times, July 17, 2003.
- "In Sudden Move, Nautilus Group Names New CEO" Archived 2011-07-11 at the Wayback Machine., FitCommerce.com, July 17, 2003.
- Robbie DiMesio, Nautilus president, CEO Hammann steps down, The Oregonian, August 13, 2007.
- "Nautilus appoints its interim leader to CEO post" Archived 2007-10-31 at the Wayback Machine., Fitness Business News, October 18, 2007.