After sitting for a few months on its board of directors, Tom Zelenovic has become the new chief executive of Bowtech, the American manufacturer of archery equipment. He previously acted as CEO of Gold Tip, a supplier of archery-related arrows, bolts, components and clothing.  At Bowtech, Zelenovic takes the place of Ron Johnson, who joined the company in 2013 and helped lead its acquisition of Excalibur.