When Kathleen Mathisen moved from a career in Norway's oil industry to join salmon farming company Grieg Seafood as human resources director four years ago, she knew the job would be a challenge -- and threw herself into her work.

But in September, life took a dramatic turn when she suddenly collapsed at the company's Bergen offices and was rushed to the hospital by ambulance.

"It happened so incredibly quickly," Mathisen told IntraFish. "I was sitting in the office and had just had a meeting.