Christine S. Breves has served as a member of our Board since October 2021. From 2013 until her retirement in December 2022, Ms. Breves held a number of senior roles at United States Steel Corporation ( U.S. Steel ), including the most recent as Executive Vice President, Business Transformation from August to December 2022. Immediately prior to that role, from 2019 to August 2022, Ms. Breves was Senior Vice President and Chief Financial Officer. As Chief Financial Officer, Ms. Breves led all aspects of U.S. Steel s financial responsibilities, including internal and external reporting, credit, tax, treasury services, investor relations, pension responsibilities, internal controls and internal audit administrative oversight. In the Chief Financial Officer role, she also led the company s global procurement function, Information Technology, Sales & Operations Planning, and real estate group. Ms. Breves was heavily involved in the development of U.S. Steel s transformative business strategy. Ms. Breves joined U.S. Steel in 2013 as Vice President Global Procurement and held a number of increasingly responsible positions including Chief Supply Chain Officer, in which she led Transtar (USS railroad subsidiary), Logistics, Sales & Operations Planning, and Global Procurement. In 2017, she became Senior Vice President Manufacturing Support and Chief Supply Chain Officer, where she led most manufacturing and supply chain support functions, including Procurement, Logistics, S&OP, corporate quality, corporate engineering, information technology, commercial pricing coordination, and several major improvement initiatives including enterprise cost reduction, working capital improvement, and asset revitalization and maintenance improvement initiatives. Prior to joining U.S. Steel in 2013, Ms. Breves was with Alcoa Corporation for 14 years in various leadership capacities including Chief Procurement Officer. In that capacity, she led a global transformation of Procurement. Since 2022, Ms. Breves has served on the boards of directors of RXO, Inc. ( RXO ), a leader in brokered transportation for freight shippers and carriers, and MPLX LP ( MPLX ), a limited partnership company of Marathon Petroleum that owns, operates, develops and acquires midstream energy infrastructure assets. She serves on the Audit Committee of RXO and on the Audit Committee and Conflicts Committee of MPLX. Ms. Breves is past chairperson of CAPS Research Advisory Board and is a past member of the national board of directors of the Institute for Supply Management. She is the recipient of the 2018 J. Shipman Gold Medal from the Institute for Supply Management and the College of Charleston 2007 School of Business of the Year Award. Ms. Breves holds a Bachelor s degree in Business Administration from the College of Charleston and was the recipient of the Wall Street Journal Award, given annually to the top business school graduate. She holds a Master of Business Administration from The Citadel.