Frank Tollefsen - Visa Size (1)

Frank Tollefsen (b 1962)

Mr. Tollefsen is a Mechanical Engineer. He has more than 33 years of experience in the oil industry covering Engineering, Technical, Project Management, Operations and Senior Management. He has also extensive experience working overseas covering all major oil-regions of the world including being responsible for major new-build program and building up drilling contractors. Prior to joining COSL in 2019 he served 4 years as CEO of Frigstad Engineering and COO of Frigstad Offshore, having dual role.


Assistant to CEO

zhou bingwen.jpgZhou Bingwen (b. 1965)
Assistant to CEO

Mr. Zhou holds a Bachelor of  Petroleum Engineering from University of  Petroleum. He has been with Chinese National Oilfield Offshore Corporation (CNOOC) since 1986. He has more than 28 years experience in almost every position of offshore drilling rig from roughneck to Rig Manager in Chinese oil and gas industry. He has also management experience on production, safety etc. in the Drilling Division. His last position was Vice General Manager of COSL Drilling China. 

VP Operations

Arild Stakkestad

Arild Stakkestad (b. 1977)

Mr. Stakkestad has more than 18 years of experience in the oil industry. After joining COSL in 2010, he has held various positions within Operations Management, such as Rig manager, Technical Advisor, SPS Project Manager and Assistant Rig Manager. Prior to joining COSL he held the position as Field Service Manager for Well Cementing Services with Schlumberger. Mr. Stakkestad holds a BEng (Hons) in Offshore Engineering from Heriot-Watt University, Scotland, UK.

HSE&Q Director

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Kjetil Andrew Tangen (b. 1975)

Mr Tangen holds a MSc within Environmental- and Natural Resource Management from the Norwegian University of Science and Technology in Trondheim (NTNU). He has 13 years of experience within HSE&Q Management from various positions onshore and offshore in Norway and abroad. Mr Tangen has been with COSL Drilling Europe since 2008.

HR & Adm Director

Osvald Borgen, (b. 1960)

Mr. Borgen holds a Bachelor of Management, Business Academy, Stavanger. He has more than 30 years of experience from the oil industry, the last 15 years from various positions within HR primarily from management. He has been working with Transocean, Amec, Prosafe and prior to joining COSL in 2006 he served 2 years with Odfjell Drilling.


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Li Baozhong (b.1965)

Mr. Li  holds a Bachelor of Management and engineering from University of Petroleum(China). He has more than 20 years of experience from managerial position within drilling and shipping industry. He had been working with COSL Drilling Europe AS since 2008. His last position was Planning and Accounting Manager of COSL drilling(China).

Finance Manager


Randi Skailand (b.1972)

Mrs Randi Skailand has a master degree in business and accounting from Norwegian School of Economics, NHH. She started her career as consultant in Andersen Consulting in 1995 and after this she worked as an auditor in PwC, she started as a Business Manager in ASO AS in 1999. After this she has had several managers positions within finance and accouting for Halliburton As (6 years) and Ocean Rig AS (5 years) before she started as a Finance Manager in COSL in 2012.

VP Market & Contract

Magnar Fagerbakke (b. 1964)

Mr. Fagerbakke holds a Master of Science in Economics and Business Administration from NHH in Bergen. He has been working with Statoil for 17 years in a number of locations and positions and has for the last 13 years prior to working in COSL worked with drilling and well related procurement. He has been working with COSL since 2008.


Director Marketing & Business Development

John Rune Hellevik (b. 1959)

Mr. Hellevik is educated in Business Administration at Bedriftsøkonomisk Institutt ( BI ) in Stavanger. He has more than 35 years of experience from the oil industry, with over 20 years in management positions within Procurement and Marketing & Contracts for Smedvig/ /Transocean/ Prosafe and Ocean Rig. Prior to joining COSL he worked for 6 years as Partner/ Managing Director for international activities in Rig Management Group.


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