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About us  -  The board of directors

The board of directors

Johan Korsmoe

Chairman of the board / VP Operations, INPEX Idemitsu Norge

Johan Korsmoe joined INPEX Idemitsu (IIN) in 2003. He has over 30 years’ varied experience in the oil industry.

Prior to joining INPEX Idemitsu, Mr Korsmoe worked 14 years in a number of positions for the Norwegian oil company Saga Petroleum included a year seconded to Statoil. The work included early phase field evaluation, engineering, gas transportation, asset management and strategy.

After joining IIN Mr Korsmoe has been assigned to increasingly senior positions and was appointed Vice President in 2012.

Johan Korsmoe holds a Master of science degree (siv.ing) in mechanical engineering from the University of Trondheim.



Yukiyo Ikeda

Managing Director, INPEX Idemitsu Norge

Yuki Ikeda joined INPEX in 2005. She has around 15 years of experience in the oil and gas development industry and was appointed as Managing Director of INPEX Idemitsu Norge (IIN) in 2022.

Her specialty is finance and sustainability. She worked for finance structuring and environment and social impact assessment in a LNG development project in Indonesia and served as Executive Director for an INPEX global finance and treasury company in Singapore. Before assigned to IIN, she was Vice President in Sustainability in Corporate Strategy and Planning Division in the INPEX headquarters.

Prior to joining INPEX, Ms Ikeda worked for the Industrial Bank of Japan in Tokyo for corporate finance and the World Bank Group in Washington DC for project finance.

Ms Ikeda holds a Master of Science in engineering from Keio University in Japan and a Master of business administration from University of Rochester in USA.



Koji Ochiai

Deputy Managing Director, INPEX Idemitsu Norge

Koji Ochiai joined INPEX in 2004 as a senior geologist to oversee E&P projects in Kazakhstan and UK. Since then, he has been working as a team leader managing New Ventures Exploration and assets acquisition opportunities in Norway, UK, Australia, USA, Southeast Asia, West Africa, and the Middle East.

Prior to joining INPEX, Mr Ochiai worked for 9 years with the Japan National Oil Corporation (now called JOGMEC) as an exploration geologist to evaluate exploration projects in Vietnam and Australia as well as a leader of a research project into the methane hydrates in Japan.

During his career, he has also worked at TOTAL E&P UK for 2 years while being seconded to an exploration project in West of Shetland (UK).

Mr Ochiai was appointed as a Deputy Managing Director, as well as Senior Vice President of Technical of INPEX Idemitsu Norge (IIN) from June 2022, after 4 years as the General Manager of Eurasia Middle East Division, and New Ventures & Global Exploration Division at INPEX Headquarters.

Mr. Ochiai holds an M.Sc. degree in Geology and Mineralogy from Hokkaido University, Japan.



Preben Grevstad

Business Development Manager, INOR

Preben Grevstad joined INPEX in 2015 as Business Development Manager. He has more than 35 years of commercial and technical responsibilities within E&P and finance.

Prior to joining INPEX, Mr Grevstad worked 15 years for RS Platou Markets and DnB Markets, both leading investment banks in Norway. Preben has also extensive experience from various E&P companies covering both technical and managerial positions, including reservoir manager for the Snorre field for Saga Petroleum.

Preben holds a Master’s degree in Petroleum Engineering from the University of Tulsa, Oklahoma, USA.




Hiroyuki Nakashima

General Manager, Commercial Coordination Unit, Europe & Middle East Projects Division, INPEX

Hiroyuki Nakashima joined INPEX in 1994. He has close to 30 years’ experience in the oil & gas industry.

Mr Nakashima has experience working for various projects including INPEX-operated projects in Japan, Venezuela, US and Indonesia. The work included commercial, business development, finance, and corporate strategy. He has been assigned General Manager of Commercial Coordination Unit, Europe & Middle East Projects Division since 2021.



Marius Lunde

Principal Reservoir Engineer / Employee Elected, INPEX Idemitsu Norge

Marius Flem Lunde joined INPEX Idemitsu as a reservoir engineer in 2011 and has 16 years of experience in the oil and gas industry. During this period, Mr Lunde also served six years in various positions on the Society of Petroleum Engineers Oslo board.

Prior to joining Idemitsu, Mr Lunde worked with optimization software in SPT Group/Schlumberger and as a consultant on CCS in Det Norske Veritas.

Mr Lunde holds an M.Sc. (Siv.ing) degree in Engineering & ICT / Reservoir Engineering from the Norwegian University of Science and Technology, and an Associate Degree in Computer Science from the University of South-Eastern Norway.



Hellen Ek

Principal Advisor Commercial & BD / Employee Elected (Observer), INPEX Idemitsu Norge

Hellen Ek joined the commercial section in INPEX Idemitsu in 2016 and has 16 years of experience from the Oil and Gas industry in Norway. She is responsible for sale and offtake of the company’s petroleum products and has extensive experience in commercial negotiations and activities.

Prior to her career within the oil and gas industry Hellen has 9 years of experience within trading and shipping of several commodities in Norsk Hydro.

Hellen Ek holds a Master of Economics and Business Administration (Sivøk) from the Norwegian School of Economics and Business Administration (NHH) and an intermediate degree in French from the University of Oslo (UiO).



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