W.R. Grace & Co. is changing its chain of command.

In an effort to increase its efficiency and improve the configuration of its reportable operating segments, the Columbia-based catalyst supplier is shuffling some responsibilities. Its Darex Packaging producing group will now report to Gregory Poling, president of the Grace Davison division, and its Grace Construction products will be under the guidance of Fred Festa, president and chief executive officer of W.R. Grace.