Letakein girl – if you google Rabbi Feivelson, the first two entries refer to the same person. It looks like it may be the Rav you are referring to.
He sounds like someone very chashuve, talmid of Rav Aharon Kotler, zatsal, born in Radin and had some kind of connection to the Chofetz Chaim, zatsal, learned in Kollel Chazon Ish for many years, I think he might be a Rosh Yeshiva in Tzfast now.
Does that sound like the Rav you are looking for?