I think that investing in your language ability would be the wisest thing to do. All of the marketing people who I have worked with are extremely proficient in

I think that investing in your language ability would be the wisest thing to do. All of the marketing people who I have worked with are extremely proficient in speaking, listening, reading, and writing. If you need a bar to shoot for, make 1-kyu on the JLPT (http://www.jlpt.jp/e/ http://www.jlpt.jp/e/) a minimum. The Jetro BJT (http://www.jetro.go.jp/en/bjt/ http://www.jetro.go.jp/en/bjt/) would be a better goal since it is a bit more difficult than JLPT 1-kyu, but Jetro no longer administers the test and I have not heard how the new test is.