Two new executives are taking the reins at Orthofeet, the maker of footwear for people with health problems that was bought in December by a group of investors led by Tuckerman Capital and Equis Capital. Mark Koide is the new chief executive, coming off a background that includes being president of Mars Inc., CEO of The Natural Dentist and head of marketing at Danone in North America. Rick Hynes, the new chief financial officer, has had similar jobs at Price Waterhouse and Hallmark Cards.