Judy L. Altmaier has served as a director of Allison Transmission Holdings, Inc. since February 2019. Ms. Altmaier, served as the President of Exmark Manufacturing Co, a subsidiary of The Toro Company, a worldwide provider of innovative solutions for the outdoor equipment, from 2013 until her retirement in January 2019. Prior to that, she was Vice President, Operations and Quality Management of The Toro Company from 2009 until 2013. Before joining Toro, Ms. Altmaier spent more than 25 years with Eaton Corporation, holding positions of increasing responsibility including Vice President of Operations, Auto Group Americas during 2009 and Vice President, General Manager Global Engine Valve Division in Turin, Italy from 2007 until 2009. Ms. Altmaier joined Eaton in 1983 as an accountant. Ms. Altmaier serves on the board of directors of Enerpac Tool Group Corp.

D. Scott Barbour has served as a Director of Allison Transmission Holdings, Inc. since May 2022. Mr. Barbour serves as the Chief Executive Officer and President of Advanced Drainage Systems, Inc., or ADS, a manufacturer of water management solutions in the stormwater and on-site septic waste water industries, a position he has held since September 2017. Under Mr. Barbour’s leadership, ADS completed a transformative acquisition in an adjacent market and repositioned itself as a pureplay water management company. Mr. Barbour refocused ADS’ resources and capital on operational improvements to drive customer satisfaction and continuous improvement, while also building out the marketing, product development and material science capabilities of the company. Mr. Barbour has also overseen the establishment of the ADS Foundation, giving the company an avenue to provide assistance and education to causes that align with its Environmental, Social and Governance priorities, water recycling and community. From 1989 until 2016, Mr. Barbour worked for Emerson Electric Co., or Emerson, a global technology and engineering company that provides solutions for customers in industrial, residential and commercial markets as President and CEO of its $4.5 billion Network Power business. During his tenure at Emerson, Mr. Barbour also held several leadership positions including Group Vice President of Emerson Climate Technologies, President, Emerson Climate Technologies Asia Pacific Division, and President, Emerson Climate Technologies Air Conditioning Division. Mr. Barbour received his Bachelor of Science in Mechanical Engineering from Southern Methodist University and his Master of Business Administration from the Owen Graduate School of Management, Vanderbilt University. Mr. Barbour serves on the board of directors of ADS.

Philip J. Christman has served as a director of Allison Transmission Holdings, Inc. since August 2022. Mr. Christman recently retired as President, Operations of Navistar, Inc., a leading manufacturer of commercial trucks, buses and engines, a role he held from May 2017 until March 2022. In this role, he was responsible for all Navistar operations encompassing engineering, manufacturing, procurement and quality. He began his career with Navistar in 1986 and held various management positions of increasing responsibility in operations, engineering, procurement and strategy. Mr. Christman has a Bachelor of Science degree in Mechanical Engineering from Indiana Institute of Technology and a Master of Business Administration from Ball State University.

David C. Everitt has served as a director of Allison Transmission Holdings, Inc. since August 2014. Currently retired, Mr. Everitt, most recently served as Interim Chief Executive Officer of Harsco Corporation from February 2014 to August 2014. Prior to that, Mr. Everitt had been with Deere Company since 1975, when he joined Deere as an engineer following his graduation from Kansas State University. Over the next nearly four decades, Mr. Everitt held positions of increasing responsibility, most recently responsible for the sales and marketing of all North America and Asia, as well as global design and production of John Deere tractors and turf and utility and global Ag Solutions Systems. Mr. Everitt also serves on the board of directors for Brunswick Corporation, Corteva, Inc. and Harsco Corporation and previously served on the board of directors of Nutrien Ltd. and Agrium, Inc.

David S. Graziosi has served as a director of Allison Transmission Holdings, Inc. since May 2018. Mr. Graziosi, serves as President and Chief Executive Officer of Allison, a position he has held since June 2018. Prior to that, Mr. Graziosi served as President, Chief Financial Officer and Assistant Secretary of Allison from January 2016 to June 2018 and Executive Vice President, Chief Financial Officer, Treasurer and Assistant Secretary since joining Allison in November 2007. Before joining Allison, between 2006 and 2007, he served as Executive Vice President and Chief Financial Officer of Covalence Specialty Materials Corporation. Prior to joining Covalence Specialty Materials Corporation, Mr. Graziosi held various positions in industry, including as Vice President of Finance Precursors and Epoxy Resins at Hexion Specialty Chemicals, Inc. from 2005 to 2006 and Executive Vice President and Chief Financial Officer at Resolution Performance Products LLC from 2004 to 2005. Prior to that, he served as Vice President and Chief Financial Officer of General Chemical Industrial Products Inc., as Finance Director of GenTeck Inc., and as Internal Audit Director and Assistant Corporate Controller at Sun Chemical Group B.V. Mr. Graziosi is also a Certified Public Accountant and a Certified Information Systems Auditor (non-practicing).

Carolann I. Haznedar has served as a Director of Allison Transmission Holdings, Inc. since November 2018. Ms. Haznedar, held various positions with E.I. du Pont de Nemours and Company from 1981 until her retirement in June 2016. Most recently, she served as Senior Vice President, Americas for DuPont Performance Materials from September 2015 until June 2016, Senior Vice President, Americas, Packaging Industrial Polymers from October 2011 until September 2015, and Senior Vice President, Global Packaging Industrial Polymers from July 2008 until October 2011. Other global businesses she led include Engineering Polymers, focused in the automotive industry, Kevlar® Life Protection, and Elastomers, serving industrial markets. Prior to E. I. du Pont de Nemours and Company, Ms. Haznedar worked for EDO Aire Corporation. Ms. Haznedar serves as a member of the Board of Directors of Harsco Corporation.

Richard P. Lavin has served as a director of Allison Transmission Holdings, Inc. since March 2016. Mr. Lavin, served as President and Chief Executive Officer of Commercial Vehicle Group, Inc. or Commercial Vehicle, a leading global supplier of a full range of cab-related systems for the global commercial vehicle market from May 2013 until his resignation in November 2015. He was a director of Commercial Vehicle from August 2013 until November 2015. Prior to Commercial Vehicle, Mr. Lavin spent 28 years at Caterpillar Inc., or Caterpillar, where he last served as Group President of Construction Industries and Growth Markets. Throughout his career at Caterpillar, Mr. Lavin held various global roles, including Vice President of the Human Services Division, Vice President of Caterpillar's Asia Pacific Manufacturing Operations, Chairman of Shin Caterpillar Mitsubishi, and other senior positions in Hong Kong, Bangalore, India, Tokyo, Japan and Beijing, China. Mr. Lavin joined Caterpillar in 1984 as an attorney in the legal department. Mr. Lavin currently serves as a director of ITT Inc.

Sasha Ostojic has served as a director of Allison Transmission Holdings, Inc. since August 2022. Mr. Ostojic is a Venture Partner at Playground Global LLC, a venture capital firm specializing in early stage deep tech companies, a role he has held since April 2019, and serves as Interim Senior Vice President of Software at Zoox, Inc., a developer of autonomous vehicles, a role he has held since November 2021. Prior to these roles, he served as Senior Vice President of Engineering at Cruise LLC, a self-driving car company, from October 2016 until November 2017 and as Vice President of Software for Nvidia Corporation, a pioneer in accelerated and AI computing, from March 2011 until October 2016. Mr. Ostojic has a Bachelor of Science degree in Computer Science from San Francisco State University and a Master of Business Administration from Santa Clara University.

General, United States Army (retired) Perna has served as a director of Allison Transmission Holdings, Inc. since August 2022. General Perna retired from the United States Army in July 2021 as the Chief Operating Officer of Operation Warp Speed, the Trump administration’s multi-billion-dollar coronavirus vaccine and treatment effort, a position he had held since May 2020. Prior to that, General Perna served as Commanding General of United States Army Materiel Command, which develops and delivers materiel readiness solutions for the Army’s land force capabilities, from September 2016 to May 2020 and as Deputy Chief of Staff, G-4 of the Army, with responsibility for oversight of the policies and procedures used by all Army logisticians globally, from 2014 to September 2016. During his 38 years of service in the United States Army, General Perna held many other staff and command assignments, including Commander, Joint Munitions Command and Joint Munitions and Lethality Lifecycle Management Command, Commander, Defense Supply Center Philadelphia, Commander, 64th Forward Support Battalion and Commander, 4th Sustainment Brigade. General Perna holds an Associate Degree in Business Administration from Valley Forge Military Academy and a Bachelor Degree in Business Management from the University of Maryland and was awarded a Master’s Degree in Logistics Management from the Florida Institute of Technology.

Krishna Shivram has served as a director of Allison Transmission Holdings, Inc. since August 2022. Mr. Shivram currently serves as Director of Ranger Energy Services Inc. since August 2017 and of Superior Energy Services Inc. since April 2021, both of which are oilfield service companies, as well as Director of Sentinel Energy Services Inc., a special purpose acquisition company, since November 2017. He also served as Chief Executive Officer of Sentinel from November 2017 until December 2020. Prior to that, Mr. Shivram served as interim Chief Executive Officer of Weatherford International plc from November 2016 to March 2017 and Executive Vice President and Chief Financial Officer of Weatherford International plc from November 2013 until November 2016. He has over 30 years of financial and operational management experience in the oilfield industry and previously worked for Schlumberger Ltd. in a variety of roles across the globe, including as Vice President and Treasurer from January 2011 until November 2013. Mr. Shivram has a Bachelor of Science degree in Economics and Commerce from Sydenham College in India and is a Chartered Accountant.