Access Midstream Partners, LP.

Burns & McDonnell Engineering Company, Inc.

ConocoPhillips Company

ENGlobal Corporation
Engineering and Construction Segment

HollyFrontier Corporation

Honeywell International, Inc.
Oil & Gas, Refining, Petrochemicals, & Biofuels

Lauren Engineers & Constructors, Inc.

Magellan Midstream Partners, LP.

URS Corporation

Victory Energy Operations, LLC.

Willbros Group, Inc.

The Williams Companies, Inc.

WorleyParsons, Ltd.

Zeeco, Inc.