Contact David A. Rockstraw, Ph. D., P. E., Inc. 2201 E. Mills Ave.; El Paso, TX 79901 (575) 523-7502 (fax) Chemical Engineering Expertise David A. Rockstraw, Ph. D., P. E. david@davidarockstrawphdpe.com (575) 635-9539 Nursing Expertise Louise Rockstraw, R. N. louise@davidarockstrawphdpe.com (575) 635-9532