FirstEnergy Corp., a $16 billion diversified energy company, appointed James Pearson CFO and senior vice president. He succeeds Mark Clark, who will become executive vice president of finance and strategy. Pearson most recently served as treasurer and senior vice president of the Akron, Ohio-based company. Since joining FirstEnergy in 1976, he has held positions including group controller for a subsidiary, First Energy Solutions. Steve Staub, the company's assistant treasurer and executive director, will replace Pearson as treasurer. Staub was also named vice president. He has been assistant treasurer since First Energy's 2011 merger with Allegheny Energy and had been Allegheny's assistant treasurer since 2007. Earlier, Staub worked at Duquesne Light and Ford Motor Co.<br /><br />Republic Services, a solid waste company based in Phoenix, named Glenn Culpepper CFO and executive vice president.  He replaces Tod Holmes, who is retiring. Prior to joining the $8 billion company, Culpepper, 56, served as CFO at Summit Materials. Earlier, he worked for 21 years at CRH, a construction materials company in Dublin, Ireland, where he served as CFO for 13 years at its North American division, Oldcastle Materials.<br /><br />Levi Strauss, the $4.8 billion San Francisco-based apparel company, appointed Harmit Singh CFO. He succeeds interim CFO Kevin Wilson, who will return to his position as vice president of finance for the company's Americas commercial operations. Singh, 49, most recently served as CFO and executive vice president at Hyatt Hotels, where he played a key role in the company's IPO. Earlier he spent 14 years at Yum! Brands, where his positions included CFO of Pizza Hut, and worked at American Express India and Price Waterhouse in India.<br /><br />Loral Space & Communications, a $1 billion satellite communications company, named John Stack treasurer. He replaces Richard Mastoloni, who is leaving as a part of the sale of the company’s manufacturing division. Stack has served as assistant treasurer for more than 10 years at New York-based Loral.<br /><br />Impax Laboratories, a pharmaceutical company based in Hayward, Calif., appointed Bryan Reasons CFO and senior vice president. He had served as interim CFO since Arthur Koch resigned in June to pursue other opportunities.  Reasons, 45, joined the $512 million company in January as vice president of finance. Previously he was vice president of finance and vice president of risk management and general auditor at Cephalon before it was acquired by Teva Pharmaceutical Industries, and later served as its vice president of finance. Earlier Reasons worked at Dupont and PricewaterhouseCoopers.