Interveiws with RY'sEasier link to readSociology Professor William Helmreich interviewed a bunch of Roshei Yeshiva years ago and wrote it all up in english.
The list of interviewees are:
Rav Shneur Kotler, Rav Yaakov Perlow, Rav Yaakov Weinberg,
Rav Yaakov Yitzchak Ruderman, Rav Elya Svei, Rav Aharon Schechter,
Rav Osher Kalmanovitz, Rav Shmuel Berenbaum, Rav Yaakov Kamenetzky,
Rav Yitzchak Hutner, Rav Moshe Feinstein, Rav Gedaliah Schorr,
Rav Mordechai Gifter, Rav Henoch Lebowitz, Rabbi Naftali Nueberger,
Rabbi Joseph Kamenetzky
This may be old news but I find it fascinating.