Make sure he's never reinforced for jumping. A lot of the time, a friendly person will pet a dog who jumps or otherwise interact. Those positive experiences can make it hard for the dog to understand that jumping isn't fun.
What technique are you using? We use the "statue" trick, where you become boring and face the wall when the dog jumps. When he sits or otherwise behaves, we come back to life and play. Timing is crucial, as is getting all guests to do the same thing. Facing the wall is also helpful.
Also, have all guests ignore the dog for the first 5-10 minutes, until he settles down on his own. Goldens are so people-oriented that they learn to get overexcited by company. It also helps if you ignore them for the first 5 minutes you're home too, so comings and goings don't get too exciting.
What technique are you using? We use the "statue" trick, where you become boring and face the wall when the dog jumps. When he sits or otherwise behaves, we come back to life and play. Timing is crucial, as is getting all guests to do the same thing. Facing the wall is also helpful.
Also, have all guests ignore the dog for the first 5-10 minutes, until he settles down on his own. Goldens are so people-oriented that they learn to get overexcited by company. It also helps if you ignore them for the first 5 minutes you're home too, so comings and goings don't get too exciting.