[Chris Hibner]

I use calculus and differential equations on a very regular basis.

For a job like mine, the most important thing is to know how to set up a calculus problem or a differential equation. Therefore, having a very good knowledge of what an integral or derivative really means is of utmost importance, and I think that gets lost on a lot of people. If a problem is put in front of you and you can say, "what we need is X, which can be determined as the integral of f(x,t,etc.)" and write the equation, that's the big deal. From that point on, most of the time the actual integration is done numerically in the algorithm that we're designing.

I summary, VERY MUCH of my job is setting up the correct equations so the algorithms can do the calculus in real-time. In that respect, I use a lot of calculus and differential equations on a daily basis.