There are a lot of immigrants in other fields are well. Sales maybe not as the skill required for sales is very hard to measure (maybe thats why). Marketing:

There are a lot of immigrants in other fields are well. Sales maybe not as the skill required for sales is very hard to measure (maybe thats why). Marketing: High level marketing executives are transfered to US regularly. Also I maybe wrong but they can come under the artist visa if they are related to anything artistic and don't need H1B. Teaching: High school salaries are pathetic and high schools wont even apply for an H1B. A lot of professors in good universities are immigrants. A lot researchers in Top universities are also immigrants. Law : The problem is that you have to do your law degree here to get entry into law, but I have seen a lot of immigrants doing that. Not in your list but Medicine: A lot of people are in medicine as well even though they have to take an exam (? or something) to see if they are trained according to US standards. Tech has most number of immigrants because large tech companies are headquartered in US, thats it. For example, a lot of doctors go to UK, because demand and NIH. I know a lot of mechanical and chemical engineers being hired by Schlum (even though its technically not a US company). Go to any US university and you will see a lot of immigrants in any technical fields training and have pretty good jobs lined up for them after graduation.