
I think it is fair to say that academic economists did not generally accept Galbraith's arguments but the critical tone of his theories had a significant impact on modern economics. His books 'The Affluent Society' and 'The New Industrial State' were the first introduction many undergraduates had to 'political economy'. One of my earliest essays, as an economics undergraduate, was to evaluate the critique that James Meade made of Galbraith's views on advertising. On balance, I sided with Meade but Galbraith left a significant impression. He was a big thinker.
Update: A discussion of his life is here. I will gather more links as they come to hand. John Quiggin posts here. A nice tribute is here, Crooked Timber's tribute here and Joshua Gans makes a statement here that parallels my own experience.