David D. Sgro has served as our chief executive officer and a member of our board of directors since our formation. He has served as Chief Operating Officer of Allegro Merger Corp. since August 2017 and its chairman of the board since April 2018 and served as its Chief Financial Officer from November 2017 until April 2018. Mr. Sgro served as Harmony Merger Corp.’s chief operating officer and secretary since its inception in May 2014 until its merger with NextDecade in July 2017 and as a director from May 2014 to August 2016 and then again from its merger with NextDecade until June 2018. Mr. Sgro served as Quartet Merger Corp.’s chief financial officer, secretary and a member of its board of directors from April 2013 until its merger with Pangaea in October 2014 and has served as a director of Pangaea since such time. Mr. Sgro served as Trio Merger Corp.’s chief financial officer, secretary, and a member of its board of directors from its inception in June 2011, until its merger with SAE in June 2013 and served as a director of SAE from that time through July 2016. From April 2006 to July 2008, Mr. Sgro served as the chief financial officer of Rhapsody Acquisition Corp. and from July 2008 to May 2011, Mr. Sgro served as a director of Primoris. Mr. Sgro has been a Senior Managing Director of Crescendo Partners, L.P. since December 2014, and has held numerous positions with Crescendo Partners since December 2005. Mr. Sgro has served as the director of research for Jamarant Capital, L.P., a private investment partnership, since January 2016. Mr. Sgro also currently serves as chairman of the board of Hill International Inc., a NYSE listed construction project management firm. Mr. Sgro served on the boards of BSM Technologies, Inc., a TSX listed GPS enabled fleet management service provider from July 2016 until its sale to Geotab in June 2019; Bridgewater Systems, Inc., a TSX listed telecommunications software company, from June 2008 until its sale to Amdocs in August 2011; Imvescor Restaurant Group, a TSX listed restaurant franchisor, from March 2016 until its sale to MYR Group in February 2018; and COM DEV International Ltd., a global designer and manufacturer of space hardware from April 2013 to February 2016. From August 2003 to May 2005, Mr. Sgro attended Columbia Business School. From June 1998 to May 2003, he worked as an analyst and then senior analyst at Management Planning, Inc., a firm engaged in the valuation of privately held companies. Simultaneously, Mr. Sgro worked as an associate with MPI Securities, Management Planning, Inc.’s boutique investment banking affiliate.

In 2001, Mr. Sgro became a Chartered Financial Analyst (CFA) Charterholder. Mr. Sgro is a regular guest lecturer at The College of New Jersey and Columbia Business School.

We believe Mr. Sgro is well-qualified to serve as a member of the board due to his public company experience and operational experience.

Eric S. Rosenfeld has served as our chief SPAC officer since our formation and will provide key services in connection with locating and consummating an initial business combination. Since August 2017, he has served as chief executive officer of Allegro and served as chairman of the board from August 2017 until April 2018. From May 2014 until its merger with NextDecade in July 2017, Mr. Rosenfeld served as the chairman of the board and chief executive officer of Harmony and served as a member of the board of NextDecade from that time until June 2020. Mr. Rosenfeld served as Quartet’s chairman of the board and chief executive officer from its inception in April 2013 until its merger with Pangea in October 2014, and has served as a director of Pangaea since such time. Mr. Rosenfeld was chairman of the board and chief executive officer of Trio from its inception in June 2011 until its merger with SAE in June 2013 and served as a director of SAE from that time through July 2016. From April 2006 until its business combination with Primoris in July 2008, Mr. Rosenfeld served as the chairman of the board, chief executive officer and president of Rhapsody and served as a director of Primoris from the completion of its business combination until May 2014. From its inception in April 2004 until its business combination with Hill International in June 2006, he was the chairman of the board, chief executive officer and president of Arpeggio and served as a director of Hill International from the time of the business combination until June 2010. Mr. Rosenfeld has been the president and chief executive officer of Crescendo Partners, L.P., a New York-based investment firm, since its formation in November 1998. He has also been the senior managing member of Crescendo Advisors II LLC, the entity providing us with general and administrative services, since its formation in August 2000. Since November 2018, Mr. Rosenfeld has served as chairman emeritus of CPI Aerostructures, Inc. a NYSE American-listed company engaged in the contract production of structural aircraft parts for fixed wing aircraft and helicopters in both the commercial and defense markets. He became a director of CPI in April 2003 and served as chairman from January 2005 until November 2018. Mr. Rosenfeld has also served on the board of Primo Water Corp. (formerly Cott Corporation), a NYSE-listed beverage company, since June 2008 and is currently the Lead Independent Director. Mr. Rosenfeld has served as a board member of Aecon Group Inc., a Toronto Stock Exchange listed provider of construction and infrastructure development services, since June 2017. Mr. Rosenfeld has been nominated to join the board of Canaccord Genuity Group Inc, a Toronto Stock Exchange listed investment bank

Prior to forming Crescendo Partners, Mr. Rosenfeld had been managing director at CIBC Oppenheimer and its predecessor company Oppenheimer & Co., Inc. since 1985. He was also chairman of the board of Spar Aerospace Limited, a company that provides repair and overhaul services for aircraft and helicopters used by governments and commercial airlines, from May 1999 through November 2001, until its sale to L-3 Communications. He served as a director of Hip Interactive, a Toronto Stock Exchange-listed company that distributed and developed electronic entertainment products, from November 2004 until July 2005. Mr. Rosenfeld also served as a director of AD OPT Technologies Inc., which was a Toronto Stock Exchange-listed company from April 2003 to November 2004, when it was acquired by Kronos Inc. Mr. Rosenfeld also served as a director and head of the special committee of Pivotal Corporation, a Canadian-based customer relations management software company that was sold to Chinadotcom in February 2004. He was a director of Sierra Systems Group, Inc., a Toronto Stock Exchange-listed information technology, management consulting and systems integration firm based in Canada from October 2003 until its sale in January 2007. From October 2005 through March 2006, Mr. Rosenfeld was a director of Geac Computer Corporation Limited, a Toronto Stock Exchange and NASDAQ-listed software company, which was acquired by Golden Gate Capital. He was also a director of Emergis Inc., a Toronto Stock Exchange-listed company that enables the electronic processing of transactions in the finance and healthcare industries, from July 2004 until its sale to Telus Corporation in January 2008. Mr. Rosenfeld also served on the board of Matrikon Inc. a Toronto Stock Exchange-listed provider of solutions for industrial intelligence, from July 2007 until its sale to Honeywell International, Inc. in June 2010. He was also a member of the board of Dalsa Corporation, a Toronto Stock Exchange-listed company that designs and manufactures digital imaging products, from February 2008 until its sale to Teledyne in February 2011. From October 2005 until its final liquidation in December 2012, he was the chairman of the board of Computer Horizons Corp., quoted on the OTCBB, that, before the sale of the last of its operating businesses in February 2007 (at which time it was NASDAQ-listed), provided information technology professional services with a concentration in sourcing and managed services. From December 2012 until December 2019, Mr. Rosenfeld served as a board member of Absolute Software Corporation, a Toronto Stock Exchange listed provider of security and management for computers and ultra-portable devices.

Mr. Rosenfeld is a regular guest lecturer at Columbia Business School and has served on numerous panels at Queen’s University Business Law School Symposia, McGill Law School, the World Presidents’ Organization and the Value Investing Congress. He is a senior faculty member at the Director’s College. He has also been a guest host on CNBC.

Adam H. Jaffe has served as our Chief Financial Officer and Secretary since our inception. Mr. Jaffe has served as Chief Financial Officer of Allegro since April 2018. Mr. Jaffe joined Crescendo Partners, LP in February 2018 as the fund’s controller and Chief Compliance Officer, and currently serves as Chief Financial Officer. Mr. Jaffe has also served as the Chief Financial Officer and Chief Compliance Officer for Jamarant Capital, L.P., an investment firm founded in 2015, since 2018. Prior to joining Crescendo Partners LP, Mr. Jaffe was the Senior Fund Accountant for the real estate private equity fund, GTIS Partners LP, from September 2016 to February 2018. While at GTIS Partners, Mr. Jaffe focused on the development of residential homes, land development, and single-family homes for rental properties across the United State and Brazil. From September 2014 to September 2016, Mr. Jaffe worked at EisnerAmper LLP. Mr. Jaffe is a New York State Certified Public Accountant (CPA).

Brian Pratt has served as a member of our board of directors and non-executive chairman of the board since August 2020. Mr. Pratt served as Chairman of Primoris Services Corp from July 2008 until May 2019 and as a Director from July 2008 to February 2020. He served as Primoris’ President and Chief Executive Officer from July 2008 to July 31, 2015. Mr. Pratt has been managing his personal investments since leaving Primoris. From 1983 through July 2015, he served as the President, Chief Executive Officer and Chairman of the Board of Primoris and its predecessor entity, ARB, Inc. Mr. Pratt has over 35 years of hands-on operations and management experience in the construction industry.

We believe Mr. Pratt is well-qualified to serve as a member of our board due to his experience and relationships and contacts.

Adam J. Semler has served as a member of our board of directors since August 2020. He has served as a member of the board of directors of Allegro since April 2018. Mr. Semler served as a member of Harmony’s board of directors from July 2014 until its merger with NextDecade. Mr. Semler joined York Capital Management, LLC, an investment management fund, in 1995 and held several positions with the firm, most recently holding the position of chief operating officer and member of its managing partner until he retired in December 2011. While at York Capital Management, he was responsible for all financial operations of the firm. During this time, he also served as chief financial officer and secretary of York Enhanced Strategies Fund, LLC, a closed ended mutual fund. Previously, he was at Granite Capital International Group, an investment management firm, where Mr. Semler was responsible for the accounting and operations function for its equity products. He also previously worked as a senior accountant at Goldstein, Golub, Kessler & Co., where Mr. Semler specialized in the financial services industry, as well as a senior accountant at Berenson, Berenson, Adler. Mr. Semler has also served on the Board of Hebrew Public, a not for profit charter school network, since May 2015. Mr. Semler is a C.P.A.

We believe Mr. Semler is well-qualified to serve as a member of our board due to his financial and accounting expertise as well as his experience with prior blank check companies.

D. Blair Baker has served as a member of our Board since August 2020. Mr. Baker has served as the president of Precept Capital Management (“Precept”), an investment management company based in Dallas, Texas, since he founded Precept in 1998. Precept invests across multiple industries and asset types, focusing primarily on publicly-traded securities. Since August 2014, Mr. Baker has served on the board of publicly-traded SWK Holdings Corporation, and he currently chairs SWK’s Audit Committee. He has also served on numerous private company boards. Prior to founding Precept, Mr. Baker was a portfolio manager at John McStay Investment Counsel, an investment management company based in Dallas that was acquired by AIG. Prior to McStay, Mr. Baker served as a portfolio manager at Friess Associates of Delaware. Mr. Baker also served as Vice President and Research Analyst at Rauscher, Pierce, Refsnes, which was acquired by RBC. Earlier in his career, Mr. Baker developed operating system software as a software engineer for a publicly-traded super-computer manufacturer named Convex Computer Corporation.

We believe Mr. Baker is well-qualified to serve as a member of our board due to his public company investing experience.

Ryan Hummer, CFA has served as a member of our board since August 2020. Mr. Hummer joined Ancora Holdings Inc., a boutique investment services firm, in 2008 and serves as Director, Alternatives Portfolio & Risk Manager where he acts chiefly as the risk manager for Ancora’s alternatives group. Mr. Hummer is also a portfolio manager for the arbitrage strategy of Ancora’s multi-strategy investment partnership. Mr. Hummer previously worked as an equity analyst and portfolio manager at a boutique large-cap value RIA in Cleveland. He performed due diligence on potential equity investments including management interviews, site-visits, competitive sustainability research, and financial statement analysis. Mr. Hummer also built complex financial models to assign intrinsic values to these equities based on diligence findings. He began his career in the financial industry in Chicago where he spent three years working at proprietary trading firms trading derivatives, primarily options and futures. Mr. Hummer holds the Chartered Financial Analyst (CFA) designation.

We believe Mr. Hummer is well-qualified to serve as a member of our board due to his experience and relationships and contacts.

Craig Martin has served as a member of our board of directors since September 2020. Mr. Martin has over 45 years of experience in the international engineering and construction industry. He is currently a board member of Team, Inc. (NYSE:TISI), which provides asset performance assurance and optimization solutions, and is the Chairman of the Board of Yarlung Records, LLC, a private company. Mr. Martin served as a board member, Chairman and Executive Chairman of Hill International, Inc., a construction project management company, from 2016 to 2018. In December 2014, he retired as President and Chief Executive Officer of Jacobs Engineering Group Inc. (NYSE), a provider of technical, professional and construction services. Mr. Martin became President of Jacobs in July 2002 and Chief Executive Officer in April 2006. He also served as a member of Jacobs’ board of directors from 2002 until his retirement. Before his promotion to President, Mr. Martin served in several positions, including as Jacobs’ Executive Vice President of Global Sales and Marketing. Before joining Jacobs in 1994, Mr. Martin worked in various roles at CRSS Constructors Inc. and Martin K. Eby Construction Co. Mr. Martin is also a National Association of Corporate Directors Governance Leadership Fellow.

We believe Mr. Martin is well-qualified to serve as a member of our board due to his significant leadership and management experience in a major engineering company.

John Ing has served as a member of our board of directors since September 2020. Mr. Ing has served as the President and Chief Executive Officer of Maison Placements Canada, an independent, Toronto-based IIROC investment dealer providing a comprehensive array of financial services to institutional investors and small to midsize corporate clients, since 1985. Throughout his four decade career, Mr. Ing has been an advocate of gold investment and authored numerous articles on the subject, appearing regularly in the media and giving speeches around the world. He is a recipient the Robert Elvers Mineral Economics Award, awarded in 2014 by the Canadian Institute of Mining, Metallurgy and Petroleum. Mr. Ing started his career with Jones Heward & Company in Montreal in 1969. He then joined Mead Company in 1972 and moved to Pitfield Mackay Ross in 1980 which was acquired by Dominion Securities in Toronto. Mr. Ing has served on numerous industry committees and on the Toronto Stock exchange Stock List Committee as its Chairman from 1993 to 2007. He is a member of the CFA Society Toronto, the Toronto Mineral Analyst Group, the Canadian Institute of Mining and metallurgy, Phi Kappa Pi and the Cambridge Club. Mr. Ing is a director of Aequitas Innovations Inc, parent of the NEO Stock Exchange.

We believe Mr. Ing is well-qualified to serve as a member of our board due to his significant leadership and management experience.