Exhibit 99.4
Mr. Gary Aman's Biography

      Mr. Gary B. Aman has been employed  with Nalco  Company  since 1994,  most
recently  serving as General Manager of ADOMITE  Subsurface  Chemicals,  a Nalco
division,  since 1999.  ADOMITE is recognized  as a technology  leader in energy
exploration additives including drilling fluids, cementing,  fracturing and well
stimulation  additives.  Mr.  Aman  received  a Bachelor  of  Science  degree in
Mathematics from the University of South Dakota in 1970.