You might want to try a letter through the mail, especially if your son has a highlight video to send with it. Also fill out the prospective student questionnaire if you did not already. I remember that we heard back from Coach Thomas fairly quickly when we did the above (don't remember if we sent an email first). You'd like to think that a coach would get back quickly in response to an email, but these coaches get zillions of them. Also, Coach Thomas was recently made chief liaison to graduates and friends of the College, and to members of the community, with the title of Ursinus Emissary. This is in addition to his duties as Athletic Director and baseball coach, so with the fall season just wrapping up maybe he may have been a bit busier then usual. I'd try again if you think the school is a good fit.