Executive Board

leads the company since July 2022. Juan Santamaría Cases has been a member of the ACS Group for more than 20 years.

He began his career at ACS in 2002 after graduating as a Civil Engineer from the Universidad Politécnica de Madrid. Between 2002 and 2006, he held different positions at Iridium and Dragados as Engineer and Project Director. Following the function of CEO at ACS Infrastructure in the U.S. and Canada from 2006 to 2013, he was President and CEO at Iridium between 2013 and 2015. From August 2015 to January 2017, he worked as Executive Manager for CPB in Australia and, in 2017, he was appointed CEO of the Industrial and Services Company UGL. From September 2017 to February 2020, he was Managing Director of CPB Contractors and Leighton, with operations in Australia, New Zealand and Asia.

He served as CEO of CIMIC from February 2020 until May 2022 and as Executive Chairman of CIMIC since November 2020.

He was appointed CEO at ACS Group in May 2022, CEO of HOCHTIEF Aktiengesellschaft in July 2022 and Chairman of Abertis in March 2023.

Photo Juan Santamaría Cases, Chairman of the Executive Board jpg (302.2 KB))
CV Juan Santamaría Cases (German) pdf (70.4 KB))
CV Juan Santamaría Cases (English) pdf (67.2 KB))

has been a member of the Executive Board since June 23, 2025 and Chief Financial Officer of HOCHTIEF Aktiengesellschaft since July 2025.

Christa Andresky has been with the HOCHTIEF Group since 2013. She started as Vice President and Controller at Turner Construction Company and expanded her leadership position with a promotion to Senior Vice President in 2017. In 2021, she was named Turner's Executive Vice President and Chief Financial Officer.

Prior to joining Turner, Christa Andresky held various positions at Harman International, Inc. from Internal Audit to Vice President and Corporate Controller.

Photo Christa Andresky, Member of the Executive Board, CFO jpg (308.7 KB))
CV Christa Andresky (German) pdf (63.3 KB))
CV Christa Andresky (English) pdf (62.0 KB))

has been a member of the Executive Board and Chief Operating Officer (COO) of HOCHTIEF Aktiengesellschaft in Essen since April 2023. He is responsible for the development of new business segments, the bidding and contract strategy as well as risk management, and is in charge of the Corporate Department Development and Mergers and Acquisition.

He has a PhD in Applied Economy from Malaga University.

Ángel Muriel joined the ACS Group in 1995 working on Corporate level and participating in different projects of Infrastructure and telecom. From 2002 to 2006, he was the CFO of Iridium in Chile, from 2006 until 2011 he worked as the CFO of ACS Infrastructure Development Inc. in the U.S. In 2011, Ángel Muriel was appointed CFO of Iridium Concesiones de Infraestructuras, S.A., in Madrid, Spain.

In 2012, he was appointed Head of Corporate Mergers and Acquisitions at HOCHTIEF, in Essen, Germany. In April 2014, Ángel Muriel joined the CIMIC Group Limited, in Sydney, Australia, as Chief Development Officer and Managing Director of Pacific Partnerships. He was also a Member of the Board of Directors of various companies of the CIMIC Group. In addition to these roles, from June 2015 to May 2017, Ángel Muriel was CIMIC Group’s Chief Financial Officer. He was the Team Manager of the takeover bid, of Abertis, and is a Member of Abertis HoldCo Board of Directors.

Since May 2017, Ángel Muriel has been Deputy General Manager to the CEO at the ACS Group Headquarters in Madrid, Spain.

Photo Ángel Muriel Bernal, Member of the Executive Board jpg (389.6 KB))
CV Ángel Muriel Bernal (German) pdf (70.4 KB))
CV Ángel Muriel Bernal (English) pdf (67.7 KB))

has been a member of the Executive Board and Chief Human Resources Officer of HOCHTIEF Aktiengesellschaft in Essen since September 2021. She is responsible for Human Resources at the Group and as Chief Sustainability Officer for ESG matters, as well as for the Corporate Department IT. She is also in charge of the field of data protection.

Since 1989, Martina Steffen has worked in different positions for HOCHTIEF. Since August 2009, she has managed the Corporate Department Human Resources for HOCHTIEF Aktiengesellschaft and in May 2021 she also took on the task of Chief Sustainability Officer for the HOCHTIEF Group and since October 2021 also was a member of the Executive Board and Labor Director of HOCHTIEF Solutions AG. Before that, she worked in various functions in IT and Human Resources at the HOCHTIEF Group. Martina Steffen is a qualified data processing expert and has a degree in Economics and IT (Administration and Economic Academy—VWA).

Photo Martina Steffen, Member of the Executive Board jpg (386.0 KB))
CV Martina Steffen (German) pdf (66.1 KB))
CV Martina Steffen (English) pdf (66.9 KB))