If you are a current or former Caltech undergraduate student and wish Professor Antonsson to write a letter of recommendation on your behalf, he will need the following items:
A good letter-writer is not (necessarily) one who you think will say nice/good things about you, but rather someone who knows you well, and has worked with you, and therefore has substantial things to say about you. A weak letter contains only: "Johnny took my class and got a B." A strong letter describes some work-related, professional, or individual interaction. For graduate school applicants, the best letter-writers are faculty who have supervised you doing a research or independent project. Ideally, you will have at least one, and perhaps two such research project supervisor letter-writers, and a third (coach, job supervisor, volunteer activity supervisor, church pastor, academic advisor, etc.). Thus, if you wish to go on to graduate school, it is to your great advantage to introduce yourself to faculty and become engaged in research projects (even as a volunteer).
ME72 has greater individual contact than a typical class, however, if this (and perhaps one other class) are your only contact with Prof. Antonsson, he will only just barely be able to write a letter with enough substance to be valuable.
Note: If you do waive your right to access the contents of the recommendation letter that Prof. Antonsson writes for you, he will be able to write more candidly and thoroughly about his impressions of you.
All U.S. citizens applying for graduate school from Caltech should apply for NSF and DoD/NDSEG fellowships. The application is easy to complete, and Caltech students stand a good chance of winning them. Please pick up an application at the Career Development Center, or see Connie Yehle in room 207 Thomas. If Prof. Antonsson writes a letter of recommendation for graduate school for you, he will gladly also write one for these fellowships.