Ms. Ainsworth, a director since 2015, served as President and Chief Executive Officer of Oiltanking Partners, L.P. and of Oiltanking Holding Americas, Inc. from 2012 until her retirement in 2014. Ms. Ainsworth was Senior Vice President of Refining for Sunoco, Inc. (2009-2012) and previously was the General Manager of the Motiva Enterprises, LLC refinery in Norco, LA (2006-2009). Before she joined Motiva, Ms. Ainsworth was director of process safety management (2003-2006) and Vice President of Technical Assurance at Shell Deer Park Refining Company (2000-2003). Ms. Ainsworth serves as a member of Kirby’s Audit Committee and she Chairs the ESG and Nominating Committee. She is currently on the boards of Pembina Pipeline Corporation (serves as a member of its Safety, Environment & Operational Excellence Committee and its HRH & Compensation Committee), HollyFrontier Corporation (chair of the Environmental, Health, Safety, and Public Policy Committee and a member of its Finance Committee), and Archrock, Inc. (serves as chair of its Nominating and Corporate Governance Committee and a member of its Audit Committee). Ms. Ainsworth graduated from the University of Toledo with a Bachelor of Science in Chemical Engineering, and she holds a Masters in Business Administration from Rice University where she served as an adjunct professor (2000-2009). She is also a graduate of the Institute of Corporate Directors Education Program (Rotman School of Management, University of Toronto) and holds the ICD.D designation.

Ms. Ainsworth has over 35 years of experience in executive and managerial positions in the United States refining industry with companies providing services for products that included crude oil and refined petroleum products, which constitute a significant percentage of the cargoes carried by the Company’s marine transportation business. She also has served as Chief Executive Officer of a public company.

Mr. Alario, a director since 2011, served as Chief Executive Officer and a director of Key Energy Services, Inc. (“Key Energy”), a publicly traded oilfield service company listed on the New York Stock Exchange, from 2004 until his retirement in March 2016. Prior to joining Key Energy, Mr. Alario served as Vice President of BJ Services Company, an oilfield service company, from 2002 to 2004, and prior to that served for over 21 years in various capacities, most recently Executive Vice President, of OSCA, Inc., also an oilfield service company. He serves as a member of Kirby’s ESG and Nominating Committee, is a member of the Compensation Committee, and has been chosen by the non-management directors to serve as the Chairman of the Board. He is the former Chairman of the National Ocean Industries Association. Mr. Alario has also served as a director of DNOW Inc. since May 2014, currently as Chairman of the Board, Chair of its Compensation Committee, and a member of the Environmental, Social, Governance, and Nominating Committee, and previously as its Executive Vice Chairman on an interim basis from June 2020 until October 2020, and as its interim Chief Executive Officer from November 2019 until June 2020. Mr. Alario graduated from Louisiana State University and holds a Bachelor of Arts degree.

Mr. Alario has over 35 years of experience in the oilfield service business, serving as Chief Executive Officer with both operating and financial responsibility for one of the largest oilfield service companies in the United States. That experience is valuable to the Board in its oversight of the Company’s distribution and services business which serves the oilfield services industry as a significant part of its customer base. As a former public company Chief Executive Officer, Mr. Alario adds that perspective to the collective experience of the independent directors.

Ms. Beder, a director since 2019, is currently the Chairman and CEO of a firm she founded, SBCC Group, ‘Strategy Building and Crisis Control’, where she heads the global strategy, risk, fintech and asset management practices. Previously, Ms. Beder held senior roles as CEO of Tribeca Global Management, a subsidiary of Citigroup, Managing Director and Head of Strategic Quantitative Investment Division at Caxton Associates, and President and Co- Founder of Capital Market Risk Advisors. Ms. Beder also spent time in various positions with The First Boston Corporation (now Credit Suisse) where she was a derivatives trader and was on the mergers and acquisitions team in New York and London. Ms. Beder is a member of Kirby’s audit committee and ESG and Nominating Committee. Ms. Beder has served on the board of American Century Investments since 2011 where she currently chairs the board and the Risk Management Oversight Committee, is a qualified financial expert on the Audit & Compliance Committee and is a member of the Portfolio Committee. Since 2017, Ms. Beder has also served as a member of the board at Nabors Industries where she is Chair of the Compensation Committee, a qualified financial expert on the Audit Committee, and a member of the Technology & Safety Committee. Ms. Beder is a Fellow in Practice at the Yale University International Center for Finance, and was previously a lecturer of public policy at Stanford University and previously a member of the Mathematical Finance Advisory Board at New York University. Previously, Ms. Beder was on the Advisory Board of the Columbia University Financial Engineering Program, and a trustee at the Institute for Pure and Applied Mathematics at UCLA. Ms. Beder graduated with Bachelor of Arts degrees in Mathematics and Philosophy from Yale University and has a Master of Business Administration degree from Harvard Business School.

Ms. Beder brings to the Board extensive asset management experience, vast knowledge of operational and risk management, and experience serving as a director for both public and private companies. Ms. Beder’s audit and risk oversight committee experience adds valuable perspective to the collective experience of the independent directors.

Mr. Davis, a director since 2015, is Chairman and Chief Executive Officer of EnLink Midstream, LLC, listed on the New York Stock Exchange. Mr. Davis served as Executive Chairman from January 2018 to August 2019 and President, Chief Executive Officer, and a director of EnLink Midstream from 2014 to January 2018, and Executive Chairman from January 2018 to August 2019. Prior to the formation of EnLink Midstream in 2014 through the combination of Crosstex Energy and substantially all of the United States midstream assets of Devon Energy, Mr. Davis had served since 1996 as President and Chief Executive Officer of Crosstex Energy, as a director of Crosstex Energy since 2002, and in management roles with other companies in the energy industry since 1984. Mr. Davis serves as Chair of Kirby’s Compensation Committee and a member of the Audit Committee. He is also a member and former president of the Natural Gas and Electric Power Society and the Dallas Wildcat Committee. Mr. Davis graduated from Texas Christian University with a Bachelor of Business Administration degree.

EnLink Midstream provides midstream energy services, including gathering, transmission, processing, fractionation, brine services and marketing of natural gas, natural gas liquids, condensate, and crude oil. EnLink Midstream’s assets include an extensive pipeline network, processing plants, fractionation facilities, storage facilities, rail terminals, barge and truck terminals, and an extensive fleet of trucks. Mr. Davis has extensive knowledge and experience in the transportation of hydrocarbons, which is the primary business of EnLink Midstream and its predecessors.

Ms. Dio, a director since 2023, served as Chairman and President of BP America from 2018 until her retirement in 2020 where she provided leadership and oversight to all BP businesses in the US. Prior to this role, Ms. Dio was the Chief Executive Office of BP Shipping from 2015 to 2018 which manages the fleet of BP-operated and chartered vessels moving over 200 million tons of products across the globe each year. From 2013 to 2015 she served as the Head of Audit, Refining and Marketing at BP where she was tasked with integrating its safety and operations risk audit and streamlining oversight and risk management across the company. Prior to these executive roles, Ms. Dio served in many other senior operating capacities with BP in refinery, chemicals and manufacturing. Ms. Dio serves as a member of Kirby’s Audit Committee. Ms. Dio has also served as an independent director with Brittania Steam Ship Insurance Association Ltd., and was a director and vice chair of the Oil Companies International Marine Forum. Ms. Dio graduated from the University of Mississippi with a Bachelor of Science in Chemical Engineering.

Ms. Dio has over 35 years of experience in executive and managerial positions in the United States marine transportation and refining industry with one of the largest energy companies in the world. Ms. Dio’s extensive industry leadership, particularly in the marine transportation industry, and governance expertise will be valuable to the Board as an independent director.

Mr. Grzebinski has served as Chief Executive Officer of the Company since April 2014. He served as President and Chief Operating Officer of the Company from January 2014 to April 2014, Executive Vice President from March 2010 to January 2014, as Chief Financial Officer from March 2010 to April 2014, and as Chairman of the Company’s principal offshore marine transportation subsidiary from February 2012 to April 2013. Prior to joining the Company in February 2010, he served in various operational and financial positions with FMC Technologies Inc. (“FMC”), a global provider of advanced technology systems and products for the energy industry. Prior to joining FMC, he was employed by The Dow Chemical Company in manufacturing, engineering, and financial roles. Mr. Grzebinski serves as a director of The Coast Guard Foundation and as a director of the American Bureau of Shipping. Mr. Grzebinski is a Chartered Financial Analyst and holds a Master of Business Administration degree from Tulane University and a degree in chemical engineering from the University of South Florida.

Mr. Grzebinski has primary responsibility for the business and strategic direction of the Company and is an essential link between the Board and the Company’s day-to-day operations. He has overall knowledge of all aspects of the Company, its operations, customers, financial condition, and strategic planning.

Mr. Stewart, a director since 2008, served as President and Chief Executive Officer of GE Aero Energy, a division of GE Energy, and as an officer of General Electric Company, from 1998 until his retirement in 2006. From 1972 to 1998, Mr. Stewart served in various positions at Stewart & Stevenson, including Group President and member of the Board of Directors. He serves as Chairman of Kirby’s Audit Committee. Mr. Stewart is also Chairman of the Board of Eagle Materials Inc. and a member of its Audit Committee and a former director of Exterran Corporation. Mr. Stewart graduated from the University of Texas and holds a degree in Finance.

During a 35-year business career, Mr. Stewart has been the principal executive officer with both operating and financial responsibility for the diesel engine and gas turbine power and service businesses at Stewart & Stevenson and then at GE Aero Energy. Mr. Stewart’s extensive experience in the engine and power products business is valuable to the Board in its oversight of the Company’s distribution and services business and complements the marine transportation and petrochemical industry experience of a number of the Company’s other directors.

Mr. Waterman, a director since 2012, served as President and Chief Executive Officer of Penn Maritime Inc. (“Penn”) from 1983 through 2012 until the acquisition of Penn by the Company in 2012. Penn was a coastal tank barge operator, transporting primarily refinery feedstocks, asphalt, and crude oil along the East Coast and Gulf Coast of the United States. He is also a director and past Chairman of The American Waterways Operators, the national trade association for the United States barge industry. Mr. Waterman serves as a member of Kirby’s Compensation Committee and ESG and Nominating Committee. Mr. Waterman holds a degree in Economics from Union College in Schenectady, New York.

Mr. Waterman has over 36 years of experience in the coastal tank barge business with Penn and its predecessor companies, building Penn into one of the largest coastal tank barge operators in the United States. Mr. Waterman’s extensive experience in that business and knowledge of its markets and customers are valuable to the Board in its oversight of the Company’s coastal business and complement the inland marine transportation, midstream energy services, and petrochemical industry experience of other Company directors.

Mr. Williams, a director since 2021, is currently Executive Chairman of the Board of Covia Holdings LLC, a provider of minerals-based solutions serving the industrial and energy markets, and was previously Chairman of the Board of Managers and a member of the Audit and Compensation committees. Prior to joining Covia Holdings, he served as the Chief Executive Officer of Nexeo Plastics Holdings, Inc., a global plastics distributor, from 2019 to 2020, and as executive vice president of Nexeo Solutions, Inc. from 2012 to 2019. Prior to joining Nexeo Solutions, from 2007 to 2012 he served as President of Momentive Global Sealants, a global specialty sealants business, and president of Momentive Performance Materials, a silicone specialty materials business. Mr. Williams also spent 22 years working in leadership roles at General Electric Company, leading a variety of industrial and material businesses globally. Mr. Williams also serves as a director of TETRA Technologies, Inc., and as a member of its Audit Committee and Human Capital Management and Compensation Committee. Mr. Williams graduated from Purdue University with a Bachelor of Science in Engineering and holds a Master of Business Administration from the University of California, Berkeley. Mr. Williams serves as a member of the Company's ESG and Nominating Committee.

Mr. Williams has over 30 years of experience in executive and managerial positions in the United States and global industrial markets. Mr. Williams’ extensive experience in various industrial markets is valuable to the Board in its oversight of the Company’s distribution and services business and complements the marine transportation and petrochemical industry experience of a number of the Company’s other directors.