Rabbi Ahron Walkin was beyond any average human being. He was a gadol in all fields, whether it came to the most dif- ficult Torah concepts or just connecting to another person.
I had the merit to learn under the Rabbi for the past couple of years and not once seeing him without a smile on his face. He always asked us when he would walk in, " the beit midrash is a happy place, you need to smile”.
At times he would walk in and see someone not happy, he would look around and say " I think I've come to the wrong