David G. Gallagher

CARBO Ceramics, Inc. is an oilfield services technology company. The firm manufactures and supplies ceramic proppant and resin-coated sand. It operates through the following segments: Oilfield and Industrial Technologies and Services; and Environmental Technologies and Services. The Oilfield and Industrial Technologies and Services segment manufactures and sells ceramic technology products and services, base ceramic proppant and frac sand for both the oilfield and industrial sectors. The Environmental Technologies and Services segment intends to protect operator?s assets and minimize environmental risks and lower lease operating expense. The company was founded in 1987 and is headquartered in Houston, TX.

American Gilsonite Co. engages in the mining and processing of hydrocarbon resin chemicals. Its products are used in the oil and gas drilling and other industrial applications. The firm sells its products to customers in primary markets including oil and gas, inks & paints, foundry and asphalt. The company was founded in 1946 and is headquartered in Houston, TX.