# Frequently (and not-so-frequently) asked questions

These are my attempts to answer some questions that students have asked (in the first assignment, in office hours, via email, etc.)

How did you get into computer science?

I entered college planning to be a math major (and I even graduated college as a math major). But I quickly learned that I would never be a great math major. More importantly, when I took my first computer science class (in Lisp, if I recall correctly), I found that CS had everything I liked about math (particularly problem solving) along with the ability to construct things and to see your solutions “in action” as it were. I’ve never looked back.

Over the past few years, I’ve started making art (mostly non-representational, sometimes with a performative aspect). I find art-making and programming have many similarities, including the great positive of making something new and interesting.

Pick a category of objects and list five of your favorite objects in that category.

Favorite ways to spend time. 1. Doing almost anything with my wife and kids - just hanging, playing games, discussing some silly topic, whatever. 2. Reading (usually science fiction or nonfiction, but I have eclectic tastes). 3. Coding (yeah, I code for fun). 4. Playing board games. 5. Organizing things (books, CDs, whatever), even though you can’t tell that by looking at my office.

I regret that “exercise” doesn’t fall in that top 5. I’m working on it.

What are your favorite board games?

Mostly ones that few people have heard of (well, two of these board gamers know, but not many other people): Cosmic Encounter. Yacht Race, Carcasonne, and Circus Maximus. But I play a lot of different games. One recent fave in the Rebelsky household is “Apples Against Humanity”: questions from Cards Against Humanity with answers from Apples to Apples. (The answers in Cards Against Humanity are not suitable for children or, well, anyone.) My eldest would like us to play more Canasta. I’d like to play more games, but there’s rarely time.

What is your favorite programming language? It may be easy to deny, but most people have a preference.

Believe it or not, but it depends on the task.

I really love programming in C. It’s efficient, it requires understanding of the machine, and it’s concise.

I love programming in Scheme about as much. I don’t think I’ve ever seen beautiful C code, but I can say that some Scheme code that one could really call beautiful. (Okay, I think lots of map-reduce is beautiful.) I play around a lot with the Mediascript code just for fun.

But when I need a quick text manipulation program, I hack it out in Perl. (However, the most recent text manipulation program I had to write, I wrote in C.)

I’m starting to find that I enjoy programming in Javascript, too, although I need a better environment for doing so. Javascript gives me many of the things I like about Scheme (other than a nice syntax) with some additional capabilities.

I’m working on expanding my use of Ruby. I hope, at some point, that I can say I enjoy working in Ruby. But I’m not there yet.

Why did you become a computer science professor?

I started studying CS because I found it really compelling - I like making things and I like formal problem solving. I became a professor because I discovered I love seeing students learn and feeling like I had a part in that learning. I also seemed to some talent at teaching.

What made you want to teach?

My mother was also a college professor. (You can see her outstanding psychology teacher of the year award inside my office door.) Although I was impressed by the effect she had on her students, I didn’t think I’d become a professor. But in college and grad school, I learned that I really liked teaching and seemed to be relatively good at it. And there are few feelings as good as seeing a student understand a complex concept and knowing you had a role in that understanding. Plus teaching is a really interesting and complex challenge.

What made you want to teach at Grinnell?

When I finished my Ph.D., I looked for places that cared about teaching but that would let me continue research. I ended up taking a non-tenure-track job at Dartmouth for a few years, but really wanted to be on the tenure track. At the time I applied, I visited lots of places. Grinnell was clearly the best fit - faculty who cared about teaching and who were willing to innovate, students who were engaged. And I was clearly a good fit for Grinnell as I got an offer really quickly after the visit. It’s been a great place to be - I continue to love the students, value the colleagues, and find myself challenged and encouraged.

Have you ever published any software?

It depends on how you define “published”. The CSC 151 software has been distributed to lots of people. A Web service I wrote, oh, two decades ago, got used pretty heavily for about five years. But almost everything I do is open source. My latest software is published on the Web.

What would you do differently if you could do college again?

Let’s see. 1. I’d learn good work habits. 2. I’d work on my writing. 3. I’d do internships.

• Work habits. I was able to get reasonably good grades in college by relying on my intellect, not on hard work. So when I got to grad school, I was screwed. Developing good work habits earlier would have made the rest of my life better.
• Writing. I did really well on writing when I was in high school (and even in a few college courses I took in HS). But my writing was not great. Not focused. Too much passive voice. Etc. I took a writing course my first year of grad school and it made me a much better writer. I wish I had done that earlier.
• Internships. I love what I do. But I really never explored anything but academia. I should have.

What’s the one food item you can’t live without?

I want to say chocolate, but I think “fruit” is probably the answer if you’ll accept that. If I have not narrow, I think it’s pears. Of course, to be literal, I think it’s water (although water isn’t food).

What is your favorite section of computer science?

My favorite courses to teach: CSC 151, because I like introducing students to the field. CSC 207, because I think it’s where you really start to develop the tools of computer scientist and software designer. CSC 282, my one-credit “C & Unix” seminar, because I can make sure you learn things that are essential. (Whoops, that’s three; I can’t choose a favorite.) Oh, I also like teaching tutorial.

I hear rumors that you are attempting to write an essay each day. Is that really the case?

Yes. Since the start of Fall 2016, I have written an essay on some topic each day. You can find them all at

The daily eboards look much nicer than what you type in class. How do I see what you type in class?

Replace the .html at the end with .md. If there’s no terminal .html, just at .md.

What technology do you use to build the course web?

I write most of the pages in a markup language called “Markdown”. I use a broader system called Jekyll to build the site. I use Bootstrap to handle some of the formatting and UI elements.