Martin Wolf is the chief economics editor for the Financial Times, and his claim to fame is that he opposed the euro from the minute the wheels were put in place in the Maastricht Treaty in the early 90's. He wrote many articles in the FT opposing the euro, but his views were deemed unfashionable - Governments tend to ignore newspapers no matter how prescient. However, Wolf is important because he managed to influence another economist who was working for him at the time, Ed Balls.
Ed Balls joined Gordon Brown's team in 1994, and when Labour was elected in 1997 and Brown became Chancellor of the Exchequer, Balls was his chief economic advisor. From the start of that government, Balls and Brown played a key but lonely role in keeping Britain from joining the euro, in the teeth of strong euro enthusiasm from the rest of the Labour team, especially Tony Blair, who wanted to join the euro as part of his "legacy". Word is that Balls and Blair actually came to a shouting match in a corridor over the issue, which has gone down in legend because people tend not to shout at prime ministers.
Anyway, Britain stayed out of the euro, and the credit has to go to Martin Wolf in the first place for being such a powerful influence on his acolyte.
Wolf has been giving a series of lectures on the eurozone crisis (of which the Greek crisis is a subset), which have now been put on Youtube. In my opinion, they are the most coherent and lucid analysis I've seen on how the crisis came about, and how it could be resolved. Here are the videos on the lecture to the Peterson Institute on May 3, 2012, and the Questions and Answers afterwards. The Q&A is notable for Wolf's view that if the euro somehow survives and establishes a strong banking union for the eurozone members, Britain will struggle as it will no longer be one amongst equals in the EU but a country swamped by a more powerful hegemon - the choice in that situation is that Britain either leaves the EU entirely to protect it's financial industry, or joins the euro, but the "in the EU but not the euro" position is not sustainable.
The videos are long and a bit technical in places, but an eye-opener nevertheless if you want a sound economic view of what is going on, and I thoroughly recommend viewing them.
The other thing to note is his pessimistic view that if the eurozone is to survive it will take five to ten years of pain - the crisis has barely begun in his view - and the key issue is political - can the political class prevail on voters to carry on with the project, or will voters blow it out of the water.