The People Behind the Company


Image of Ernst Grissemann, CEO of Green Tech Mining & Services and Gulf Green Tech
Ernst Grissemann

25 years of experience in Project Implementation and in Company Management, out of which 18 years were in large-sized, stock exchanged listed corporations (such as STRABAG SE, VAMED AG and Bauer AG).

6 years served as a professional Army officer.

16 years total experience in the management of companies in China, Jordan, UAE and Oman, whereby in total 9 years in Oman.

Invited member of the Omani National Program for Diversification of the Economy away from Oil and Gas (part of the Vision Oman 2040).

Awarded with the Global Water Award 2011.

Lead executive for implementing PDO’s Nimr Water Treatment Plant (largest constructed wetland in the world) in Oman to treat 175,000 m3/d “produced water”.

International recognised adviser in engineering standards consolidation. 

Civil Engineer from the “Higher Technical College for Civil Engineering and Art” in Innsbruck, Austria.

Image of Klaus Müller (Mueller), CTO (Chief Technology Officer) of Green Tech Mining & Services and Gulf Green Tech
Klaus Müller

33 years experience in the oil & gas industry with Shell International in a variety of managerial and leadership roles around the globe.  

Expert in oil & gas production engineering, project development, change management and technical innovation. 

Developed Shell’s first fully automated oil field. Spearheaded the concept of collaborative working environments in Petroleum Development Oman, transforming the way of working for an entire corporation. 

Instrumental in establishing solar PV as a renewable energy source in Oman as a cofounder of Shell’s project “Solar into Schools”. 

Global Technology Manager for Shell’s Joint Ventures.

CEO of Gulf Green Tech LLC, an environmental technology company for energy and water.

MSc in Petroleum Engineering from the Mining University Leoben, Austria.

Board Members

Ernst Grissemann
Ernst Grissemann
Rashid Salim Abdullah Al-Toqi grey.jpg
Rashid Al-Touqi
Board Director

CEO of Oman Mining Company.

More than 20 years of experience in financial management and turn-around management. 

MSc in Accounting from Australia.

Klaus Müller (Mueller)
Klaus Müller
Board Director
Nasser Al Maqbali
Board Director

Chairman of Oman Mining Company.

CEO of Minerals Development Oman SAOC.

28 years of experience in executive, operation, and project management, consulting, and business development.

Technical Advisory Panel

Assistant Professor Dr (doctor) Alexandros Stefanakis
Asst. Prof. Dr. Alexandros Stefanakis
Advisory Panel

Assistant professor in the school of environmental engineering at Technical University of Crete, Greece

International circular economy and sustainability expert

Visiting professor at German University of Technology Oman

Environmental engineering and research specialist focusing on water and wastewater engineering

Assistant Professor Dr (Doctor) Diplom Ingineur Diplom HTL Ingineur Rüdiger (Ruediger) B Richter
Asst. Prof. Dr. Dipl.- Ing. Dipl. (HTL)- Ing. Rüdiger B. Richter
Advisory Panel

Visiting professor at Montan University Leoben in Mining Engineering

Visiting professor at the German University of Technology Oman

International expert in mining processing engineering

Author of scientific articles and mining processing engineering chapters of technical lexica

Head of waste treatment and NORM centre of excellency in Bauer

Lars Hendrik Bellmann.jpg
Lars Hendrik Bellmann
Advisory Panel

Senior Geologist at PDO

Author of various scientific articles under ADIPEC and EAGE Congress (UAE & France)