To Whom it May Concern, I am privileged to write in support of Atef Ben Khala, geoscientist with whom I used to be lucky to work with . I am looking forward to collaborate with Atef again. Scientifically, Atef has strong skills in terms of sedimentology/diagenesis in both carbonates and clastics geology. To my knowledge, He is gifted for efficiently leading both exploration and development works and solving related oil & gas issues. In terms of work organization, Atef is of great value i.e. on time or often in advance for delivering reports and cleverly planning scientific projects. In addition to be accurate, relevant, federative and diplomatic, Atef does fluently speak at least three languages. I am confident Atef will continue to efficiently solve Oil & Gas exploration issues and beyond. Sincerely, Thibault Cavailhes Associate professor, Tectonics, University of Bordeaux, France

Atef was hired into DNO's Tunisia organization as a Senior Geologist in January 2014. Since then he has proven himself as a knowledgeable and dedicated professional, as well as a valuable teamplayer. Atef has a very positive attitude towards all challenges and deals with them in a constructive well structured way. I can give Atef my best recommendations.

To Whom it May Concern, I am privileged to write in support of Atef Ben Khala, geoscientist with whom I used to be lucky to work with . I am looking forward to collaborate with Atef again. Scientifically, Atef has strong skills in terms of sedimentology/diagenesis in both carbonates and clastics geology. To my knowledge, He is gifted for efficiently leading both exploration and development works and solving related oil & gas issues. In terms of work organization, Atef is of great value i.e. on time or often in advance for delivering reports and cleverly planning scientific projects. In addition to be accurate, relevant, federative and diplomatic, Atef does fluently speak at least three languages. I am confident Atef will continue to efficiently solve Oil & Gas exploration issues and beyond. Sincerely, Thibault Cavailhes Associate professor, Tectonics, University of Bordeaux, France

Atef was hired into DNO's Tunisia organization as a Senior Geologist in January 2014. Since then he has proven himself as a knowledgeable and dedicated professional, as well as a valuable teamplayer. Atef has a very positive attitude towards all challenges and deals with them in a constructive well structured way. I can give Atef my best recommendations.

To Whom it May Concern, I am privileged to write in support of Atef Ben Khala, geoscientist with whom I used to be lucky to work with . I am looking forward to collaborate with Atef again. Scientifically, Atef has strong skills in terms of sedimentology/diagenesis in both carbonates and clastics geology. To my knowledge, He is gifted for efficiently leading both exploration and development works and solving related oil & gas issues. In terms of work organization, Atef is of great value i.e. on time or often in advance for delivering reports and cleverly planning scientific projects. In addition to be accurate, relevant, federative and diplomatic, Atef does fluently speak at least three languages. I am confident Atef will continue to efficiently solve Oil & Gas exploration issues and beyond. Sincerely, Thibault Cavailhes Associate professor, Tectonics, University of Bordeaux, France

Atef was hired into DNO's Tunisia organization as a Senior Geologist in January 2014. Since then he has proven himself as a knowledgeable and dedicated professional, as well as a valuable teamplayer. Atef has a very positive attitude towards all challenges and deals with them in a constructive well structured way. I can give Atef my best recommendations.