Glen A. Barton. Retired Chairman and Chief Executive Officer of Caterpillar Inc. Mr. Barton is the Lead Director. Vincent A. Calarco. Retired Chairman, President and Chief Executive Officer of Crompton Corporation. Noreen Doyle. Former First Vice President of the European Bank for Reconstruction and Development. ... Glen A. Barton. Glen Barton is the former Chairman and Chief Executive Officer of Caterpillar Inc. He is a member of the Board of Directors of Valmont Industries.Vincent A. Calarco. Vincent Calarco is the former Chairman, President and Chief Executive Officer of Crompton Corporation. He is Director of the ... BOARD OF DIRECTORS. Glen A. Barton. Retired Chairman and Chief Executive Officer of Caterpillar Inc. Mr. Barton is the Lead Director. Vincent A. Calarco. Retired Chairman, President and Chief Executive Officer of Crompton Corporation. Noreen Doyle. ...