The Chafetz Chaim and His Seforim
The Chafetz Chaim is known for the many seforim that he wrote. Through his various seforim, the Chafetz Chaim made an incredible impact on all of Klal Yisroel. I don't even need to tell you how widespread the Chafetz Chaim and the Mishna Berura are today. These seforim are accepted universally and can be found in every shul, even though they are less than 100 years old!
Many of his seforim aren't well known. Many of these seforim were written for certain segments of the Jewish population. For example, he wrote "Machaneh Yisrael" for Jewish soldiers who were conscripted into the Russian army. In the Chafetz Chaim's days, young kids were often taken by the Russians to serve in the army and they were not released until adulthood. The Chafetz Chaim wrote "Machaneh Yisrael" for these Jewish soldiers so that they would have direction in how to live Jewishly despite not being in the best of circumstances. Similarily, he wrote "Nidchei Yisroel" to provide guidance for Jews living in populations where there were not a lot of other Jews.
Moshe Lichtman's Seforim Have Changed My Life
Each of the Chafetz Chaim's seforim were written with a certain goal in mind and each sefer has changed Klal Yisroel in a certain way. For example, Sefer Chafetz Chaim is about the gravity of speaking "lashon hara" and has been instrumental in the decrease of Lashon Hara that is spoke today.
Most of Moshe Lichtman's seforim have one goal in mind: teach Klal Yisroel the importance and beauty of Eretz Yisroel as a key part of the Torah (as Rabbi Lichtman quotes in the back of one of his seform, Reb Yaakov Emden says: Eretz Yisroel is the peg that the entire Torah hangs on).