Anyone can write a letter of recommendation without any restrictions. However, whether the recommendation letter can play a role depends mainly on several factors: first, the relationship between the recommender and the recommended person must be a working relationship, and it must be a relatively close relationship, such as a teacher and a tutor; The second is whether the position of the referee is important, such as a leader or a famous professor; The third is whether the recommendation letter is credible and whether it is based on facts. In your situation, it is better to let teachers or leaders in departments or colleges write letters of recommendation, and let people from different fields write letters of recommendation, at best from aspects such as personality, but definitely not academically. How to prove that the recommendation letter is true? The standard American answer is: Everything is true unless there is reason to doubt its authenticity. China students are so common in American universities, who can be sure that the admissions officer has not seen the recommendation letter from the professor indicated here? Hmm. How interesting