The Team

Maël Corboz, Founder & CEO

Professional football player & Sustainability expert


Maël, a passionate professional soccer player at SC Verl in the German third tier. After obtaining a degree in Mechanical Engineering with a focus on energy systems from the University of Maryland College Park in 2015, he ventured to Germany to advance his football career. Along the way, he noticed that environmental protection and sustainability were often overlooked in many clubs. There often exists a gap between a club's sustainability goals and the actual investments in time and effort.

This realization led Maël to delve deeper into the intersections between football and sustainability. As a result, he co-founded elevengreen with the aim to bridge the divide between clubs' aspirations for sustainability and the feasible means of implementation. elevengreen is the product of his passion for football and commitment to a more sustainable future in sports.


Andreas Kästner, Partner

Greenhouse Gas Accounting & Decarbonization


Andreas is the founder of viacero.earth and supports companies on their journey towards a more climate-friendly and sustainable future. He assists businesses from various sectors in creating their Corporate Carbon Footprint (CCF) and in the subsequent reduction of their CO2e emissions.

Before founding viacero.earth, Andreas gained experience in various positions within the energy sector, working for Stadtwerke Kiel Netz GmbH, Lumenaza, and 50Hertz, among others.

Environmental and climate protection have been lifelong passions for him. His interest was sparked as a youth football player during a trash collection event in the forest of his hometown. During his travels to South America, he decided to also pursue this issue professionally. After gaining experience in the field of renewable energies, he has been supporting companies in creating their greenhouse gas inventories since 2020.

Josef Krieg, Partner

Sustainability & Communication


Josef brings rich experiences from politics, economics, civil society, and academia. He served as a personal assistant to Dr. Heiner Geißler, a member of the German Bundestag, as well as a security policy spokesperson and personal assistant to the Minister of Defense, Volker Rühe. His roles as Communications Director at the Robert Bosch Foundation in Stuttgart and Stiftung Mercator in Essen have significantly shaped his career. Josef is a lecturer in organizational communication at Zeppelin University in Friedrichshafen. His diverse expertise culminated in the founding of "ideas2communicate GmbH," specializing in sustainability strategy, reporting, and communication. Since July 2023, he has been a proud partner at elevengreen.

Oliver Schraft, Partner

Sustainability & Marketing


For nearly 30 years, Oliver has been involved in professional sports as a press officer, media director, and executive team member at VfB Stuttgart and VfL Wolfsburg. His close collaborations with media, clubs, associations, and sponsors have forged an impressive international network. Today, he shares his comprehensive knowledge in sports, corporate social responsibility (CSR), and sustainability as an independent communication consultant and coach for sports, business, and NGOs. Oliver is the founder of the communication consultancy OUTOFTHEBOX and has been a partner at elevengreen since 2023.


Stefan Frödert, Partner

Finances & Strategy


Stefan serves as a bridge between football and the business world, contributing his expertise in finance, strategy, sports, and sustainability as a partner at elevengreen since 2023. Stefan's own football career took him to Germany's 1. FSV Mainz 05 U23 team and the highest college league (NCAA D1) in the USA. His recent role as Chief of Staff at DFL Deutsche Fußball Liga GmbH provided deep insights into executive management. Prior to that, he spent nearly 8 years at BASF, a DAX-listed company, working on international projects in Hong Kong, Japan, Mexico, and the USA. His expertise spans finance, mergers and acquisitions (M&A), strategy, sustainability, and transformation processes linked to the EU Green Deal.

In addition to a Bachelor's degree in International Management and Finance from Towson University in the USA, Stefan holds a Master of Science in Management from the University of Mannheim (majoring in Business Administration). Furthermore, Stefan is a CFA charterholder and has extensive experience in the fields of finance and portfolio management.


Let's team up!



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