Short version: Self-Discovered
Long Version:
My third grade teacher picked a handful of students to do a special extra unit. He had us each choose a company's stock to "invest" in (I chose a local company, Northland Cranberries), and we learned to look up the tickers in the newspaper and understand how the value changed. We followed our stocks throughout the year, and that was when I first began to understand the idea of investing and making your money work for you.
In 8th grade I got my first summer job at the municipal swimming pool. I remember telling my mom that I would save 50% of what I made, and planned to keep that up for my life. Should be easy, right? Its not like I actually needed to spend anything. My mom thought it was a good idea, encouraged me, and also said that I probably wouldn't be able to do that once I had to start supporting myself. Proud to say that since 8th grade, my savings rate has continued to be >50% every year :)
After high school, I had the fortunate situation of having a surplus of scholarship money. So, I did some research and came to the conclusion that I needed to start maxing out a Roth IRA and compounding some money for an early retirement. Unfortunately, the stock market quickly crashed, and I lost a lot because I had picked a bunch of crappy individual stocks (my strategy was to just pick the highest dividend yield stocks with a S&P Stars rating of >3). However, I just considered it all a grand experiment that really didn't matter, and continued plugging away. I landed some good internships and worked two jobs (~30 hours per week) through college. For the internships I even tried to get into their 401k programs, but was never eligible. By my senior year of college, my future wife and I were engaged. She had ~15k in student debt, but even better frugal tendencies than me. I decided to start giving her money to max out her own Roth IRA, and we graduated/got married/started some good engineering careers in 2011. As soon as we were elgible, we also began maxing our new 401ks. My wife's first year she wasn't eligible for her 401k until October, so for the last three months we set her contributions to 100%...This really confused HR:) Somewhere along the line about 2 years ago I discovered MMM, and thought it was cool that there were actually a lot of other people doing this.
Fast-forward 4 years, we now have three-month-old identical twin boys, and my wife has left the workforce to become a SAHM. Net worth is sitting just north of $400,000, and I figure I've got about 5-10 more years until FI, at which point I will probably keep working if I enjoy my job as much as I do now.