Most of the world's business is done in English, but he already speaks English. It'd be better for him to evaluate who he'll be working with and learn their language. Spainish won't do him a lick of good if he's working with Moroccans or Saudi's or Hong Kong businessmen. Spainish is a great skill if he owns a small business but if he works for a company doing international work its only the best choice if he's working in South or Central America.