He was a disciple of Israel Salanter. It might be worthwhile mentioning a few things about him. First of all I think the Stipler Rav was his son in law. [That is the author of the Kehilat Yaakov.]
The major point of Navardok was trust in God with doing nothing to get one's needs. You can see this in the book put together by one of his students the מדרגת האדם. I mean trust in God with no השתדלות
I know people are used to thinking of trust with effort. But the idea of Navardok was definitely opposed to this idea. The Altar of Navardok himself I think got this idea either directly from Israel Salanter or found it in an essay written by Israel Salanter where Israel Salanter attributes this idea to the Ramban.[No one knows where this Ramban is.]
But for sure there is at least one definite source for this idea--the Gra on proverbs 3:5.
What this meant for most people following this path was to learn Torah and not worry about "parnasah" [making a living]. But it does not have to mean that. It mainly means to be doing God's will as defined in the Torah and let God take care of the rest.
[I have to add that I think the main problem with the Musar movement is they did not add Jewish Philosophy along with it. That is Saadia Gaon, Rambam, Ibn Gavirol, Albo and Abarbenal. I don't think Musar works to improve character unless it comes with world view issues that are treated in these works of philosophy.
These great people represent real Torah. The sad truth is the Torah has no true representatives today. And the most dangerous and evil are those who claim to speak in the name of the Torah.