Our expedition leader (Woody) was fantastic. He was friendly, approachable and very experienced in leading trips like this. Together with the captain, he showed a great respect for the wildlife and a knowledge of the changing sea conditions around Svalbard. Woody's ability to 'change the schedule' at a moments notice to ensure we got the most out of the trip was quite incredible.
This was our first trip with Paul Goldstein, who is very competent, knowledgable and extremely focussed in everything he does. I am sure most of the drive and determination to see as much as possible was down to him. He will certainly do everything in his power to ensure you have a good trip, and his knowledge of photography and wildlife are excellent.
However, I didn't find him particularly easy to talk to, or approach. He tended to favour a few passengers and I found it hard to approach him for advice about photography (luckily, the other passengers and crew were very helpful)! I also largely agree with his views, but he should also learn to listen to others and respect their views too.