Yisro

R' Avraham Ben Harambam says that his father followed the opinion that Yisro came to Moshe after the giving of the Torah at Sinai. He says that otherwise it would have been too short of a time for Yisro to hear about the miracles and then arrive before Matan Torah. There is an irony here because this would mean that the two children of Moshe were not present at Mount Sinai. In Exodus Perek 18 pasuk 6, Yisro refers to the children as "her"(Tziporah's)children and not Moshe's children. The pasuk perhaps is telling us that as a result of his children not being present at Har Sinai they were not considered Moshe's children but were outside the influence of klal yisroel and were instead under her influence. In fact the Rambam writes in Yesodei Hatorah chapter 8 Halacha 1-2, that the reason we believe in the prophecy of Moshe is not because of the miracles that he performed but because of what we heard at Har Sinai. The Rambam also writes in his Igeret Teimon that anyone that denies the Torah or Moshe Rabbeinu, it can be assumed that his forefathers were not present at Har Sinai. So it is not surprising that a descendant of the children of Moshe was the infamous Michah that was known for his idol-Pesel Michah.

The question still remains why did the Torah tell the story of Yisro before Har Sinai if in fact it took place after. If we look at the advice that Yisro gave Moshe in judging the people we may have an answer. Yisro tells Moshe in Perek18 Pasuk 20 "and you shall make known to them the path in which they should go and the deeds that they should do". The Rambam states in his Sefer Minyan Mamitzvohs(Shoresh 2),that many mitzvohs are learned out from this pasuk that fall under the single mitzvah of "love thy neighbor". They include doing gracious deeds,visiting the sick,burying the dead,laws between man and his fellow man(monetary laws) and performing good deeds even outside the letter of the law. Yisro then tells Moshe in Pasuk 21, that he should appoint judges from "men of accomplishment,G-D fearing people,men of truth and people who despise money". The Rambam in Sanhedrin perek 2 halacha 7 explains "men of accomplishment" as one that is strong in the commandments and controls his urges until there is no embarrassment or bad name. Also included from "men of accomplishment"is to save the oppressed from the oppressor(justice). He continues that "men of truth" means people that run after righteousness,who love truth and hate corruption. He then says that"Who despise money" are people that aren't busy running after money.
It is this kind of person, that has accomplished these kind of attributes and perfections that can potentially rise to the level of the Jews at Har Sinai and possibly relive the experience of prophecy. It is for this reason that the Torah tells us the story of Yisro before Har Sinai. Yisro is in fact the future recipe to our reliving the experience throughout history.