Mulberry, Fla.-ArrMaz Custom Chemicals Inc. has been acquired by management and certain funds managed by GSO Capital Partners LP, an investment advisor with approximately $5 billion in assets under management and with offices in New York, Houston, and London. ArrMaz will continue to be led by Glen Varnadoe, CEO, and Rob Brinkman, CFO. Key management changes include the promotion of Jeffery Walker to chief marketing officer, William (Bill) Cook Jr. to chief manufacturing officer, M. Roger Rixom as vice president of technology and business development, and the hiring of Douglas Wilson to the position of vice president of corporate development. ArrMaz, headquartered in Mulberry, Fla., makes a wide variety of industrial process chemicals, most of which are custom formulated to fit customer applications.