Classes Taught as
a Lecturer (Instructor of Record)
- Introduction to Real Analysis (M 361K).
- Differential and Integral Calculus (M
408C). Summer 2009.
Classes Taught as an
Assistant Instructor (Instructor of Record)
- Supervised Teaching in Mathematics (M 398T).
- Differential Calculus (M
408K). Spring 2007, Fall 2007, and Spring
- Elementary Functions and Coordinate Geometry (M
305G). Fall 2005 (two sections), Spring
2006, and Summer 2007.
- Elementary Functions and Coordinate Geometry with
Parallel Instruction (M
305G and M
210T). Fall 2006.
Classes Taught as a Teaching
- Advanced Calculus for Applications I (M
Training and Affiliations
- Assisted Ombudsman, Department of Mathematics,
UT-Austin, checking students’ prerequisites and advising them during
course registration add/drop period, Spring 2009.
- College of Natural Sciences Teaching Strategies
Workshop. The University of Texas at Austin. October 17-18,
- Co-founded an independent record label, I Eat Records,
2005. Released and promoted seven albums for six different
artists. Booked and promoted national tours for five different
artists, including several local benefit shows for SafePlace and Capital Area Food Bank of Texas.
- Associate Editor, Publishers Resource Group, Austin,
TX, March to August 2002. Edited and authored content for
Prentice Hall high school mathematics textbooks to match education
standards specific to each state.
- The University of Texas at Austin Women's Athletics
- Resident Assistant, Division of Housing,
The University of Texas at Austin, Fall
2000 and Spring 2001.
- Tutor/Mentor, Lincoln Action Program, Lincoln, NE,
Spring 1999, for middle school students overcoming socioeconomic
- Tutor, Office of Multi-Cultural Affairs, University of
Nebraska-Lincoln, Spring 1999, for international students overcoming
language and cultural barriers.
- Actuarial Intern, USAA,
San Antonio, TX. Received Way2Go Award for analyzing competitive
position for various automobile insurance policies. Summer 1999.
- Actuarial Intern, Ameritas
Life Insurance Corporation, Lincoln, NE. Received Silver Bison
Award for automating production of quarterly performance reports for
life insurance products. 1998.
- Resource Planning Department Intern, CPS Energy, San Antonio, TX.
Received Student Assistance for Education Scholarship for conducting
mathematical models to forecast future energy consumption and
production. Summers 1996 and 1997.
a typical class of mine, enjoying mathematics as usual
Anonymous Student Comments from Course Evaluations
felt Mr. Callahan was always willing to help students and encourage
questions. He always tried to explain material in different ways to
reach out to the students and give examples.”
Callahan is a passionate and understanding instructor. His lectures
were entertaining as well as informative and educational. He was
always available when I needed help.”
teaching skills, fully capable and knowledgeable. Best math
instructor I’ve had to date. He engaged the class, made us feel
free to ask any questions, and overall explained everything clearly
was an extremely competent and effective teacher. He made the class
fun and truly gave me an appreciation of calculus that I would not
have gained otherwise.”
best teacher I have had in my whole life. He made me feel confident
in my work by explaining everything very well. Was very helpful in
and out of class. Most of all, he made class fun and worthwhile.”
was an excellent instructor, one of my favorites. His class was
enjoyable as well as informative. He knows how to mix humor into the
material which makes it easier and more enjoyable to attend
took the time to make sure you understood everything. If you didn’t
get it, it wasn’t awkward to ask; he was really easy to ask for
seemed very enthusiastic and was always open for questions. I’m
terrible at math, but he explained the material very well, in a way I
instructor was the most well organized I have had so far. He made
available lots of opportunities for learning that was beyond his
effective teaching methods. Ensured that his students understood the
course material. Even students not registered for his section sat in
on his lectures.”
is a great prof. He will explain topics until everyone understands
them. He is also easy to talk to.”
Callahan has been the most talented math teacher I have ever had. His
notes were very informative and helpful; without him, let’s
just say I would have been in trouble. He seems like a nice guy, and
it was cool how he learned the names of his students and truly
loved how you wrote out everything so if I didn’t catch it the
first time it’d be on the board, but what I enjoyed the most in
this class was how you always showed us where we were in the world of
differential equations, and your great sense of humor helped me stay
awake and prevented the class from getting too boring. Best TA I’ve
had thus far.”
Callahan is a thoughtful, caring instructor. He is concerned with
our progress as TAs and has valuable advice to give. He also cares
about us as grad students, how we are doing with prelims. He does a
great job and is very knowledgeable.”