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About Our Board Members


Executive Council Members

Angie Shindelar, President

My passion is supporting teachers and students to teach and learn math in meaningful ways that build understanding.  I have been an NCTM and ICTM member for over 20 years. I value the learning and sharing of ideas as well as the support from both organizations. The Math Community has become more accessible in the digital age and I love feeling connected to so many people in math education both around the state and nationally. I taught middle school math for many years and was also a math consultant with Green Hills AEA. After several years away from teaching I found myself missing kids! In 20-21, I returned to the classroom and am enjoying spending my days with 6th graders.

Lori Mueller, Past-President

Currently, I am a Math Consultant for Great Prairie AEA. I love working with schools and helping them to create better systems in which to teach our children. I also love teaching classes that teachers can use for renewal credit for their teaching licenses. I am lucky to be in a job where I am able to meet so many big name people in mathematics, as mathematics is my passion. Reading and spending time with my family are also passions for me. If you have questions about ICTM I would love to help answer them. Check us out on Facebook too!

Suzanne Riehl, Vice President Post-Secondary

I teach at the University of Northern Iowa. I started here in 2001 after finishing graduate school and have taught a wide variety of courses to non-majors, pre- and in-service elementary/middle school teachers, and mathematics majors. Recently, I have taught many sections of Calculus I with a few upper level courses for variety. In addition to the content learning goals of any particular course, I emphasize learning about learning mathematics and encourage students to develop productive study methods, metacognition, and a growth mindset. Although my degree is in mathematics, I have always been fascinated with how people learn and so strive to improve my teaching. I’m pleased to serve on the board of ICTM! Outside of school, I enjoy yoga, long walks, and gardening. I also regularly play duplicate bridge and occasionally complete a knitting or quilting project.

Sharon Jaeschke, Vice President Secondary

I am recently retired from 35 years of teaching mathematics courses that ranged from 7th grade math to calculus. My career started with the Cedar Valley School District, which then merged to become Prairie Valley, and, since then, underwent another sharing agreement, becoming Southeast Valley High School. In 2001, I became a trained teacher mentor and working with pre-service and beginning teachers has become a passion for me. I love helping teachers find ways to make their lessons engaging and meaningful for students. Belonging to ICTM was extremely helpful to me over the course of my career, and I am excited to serve on the Board. I earned my bachelor’s degree in mathematics and computer science from Central College and a Masters of School Mathematics from Iowa State. I spend as much as possible with my four children and two grandsons. I am also passionate about fitness and sports, having coached most of them at some point in my career!

Sarah Martin, Vice President Middle School

Hi, I currently teach 7th grade math in Shenandoah, Iowa.  I am a huge UNI fan earning both my BA and MA from there. I am a member of both ICTM and NCTM.  My passion is middle level mathematics and finding new ways to engage learners. I am very active on Twitter. When I’m not working on math I like to read, hang out with our goats, garden and travel with my husband.

Kristin Grotewold, Vice President Elementary

Currently, I serve as the K-5 Math Instructional Coach for the Waukee Community School District. Prior to that I have been a building instructional coach, district instructional mentor and taught a variety of grade levels K-12. I attended the University of Northern Iowa and obtained my Elementary and Middle Level Education major with minors in Math and Social Studies. While at UNI, I was fortunate to partner with faculty and co-create TEAM (Teaching Educators About Mathematics). I love teaching students and helping teachers enhance their math instruction and interventions.

My husband and I spent much of our time supporting our kids at their sporting events. Tatum is 10, Lincoln is 8, and Kenzie is 2.

Treasurer & Secretary

Deb Tvrdik, Treasurer

I have been a member of ICTM for over 40 years and have served on the board in various positions. I began as a regional director in AEA 3. In addition to my present position, I have served as President, NCTM representative, and Journal Editor. Serving on the board has allowed me to meet many dedicated math educators from across the state. The interaction with others has always been a source of inspiration and has challenged me to keep current with the best practices in mathematics education.

I received my BA from the University of Northern Iowa and my MSM from Iowa State University. I began my teaching career in Algona at the middle school and then taught high school math at Paton Churdan. The majority of my career was as a high school math teacher at Fort Dodge Senior High. Presently, I am an online Statistics instructor for University of Upper Iowa and Iowa Central Community College. I still love seeing students have those “aha” moments.

My husband and I were both career educators and have 2 adult children who are both married. In my spare time, I enjoy spending time with my family, especially my 3 grandchildren! Being semi-retired has allowed me to travel and play duplicate bridge at the tournament level.

April Pforts, Secretary

I have been a member of NCTM for about 15 years, and a member of ICTM for about 5 years. I have taught middle and high school mathematics in Iowa for 10 years before becoming the mathematics consultant at the DE. I love leading mathematics educators because I am able to impact students through their teachers, coaches, and administrators. I want students in Iowa to be the best problem solvers in the world. I want mathematics to never be the barrier for a student to go after their dreams. I love to binge watch Net-flicks, travel, and hang with my family. Representing and serving the state of Iowa at the national level is both rewarding and humbling.

Regional Directors 

Mike Bevelacqua, Regional Director, Grant Wood AEA

Currently, I teach mathematics at City High School in the morning and in the afternoon I work with teachers throughout the district as an Instructional Design Strategist on the ICCSD Innovation Team.  In the Spring you will also find me coaching the CHS Varsity Girls Golf Team. I believe in equitable, student centered, future focused instruction with high expectations and worthwhile opportunities for all children.  In my classroom; everyone’s story is their own, everyone is a student, and everyone is a teacher. Away from work, I enjoy traveling, Hawkeye sports, playing golf, and spending my family and friends. 

Jordan Edgerly, Regional Director, Heartland AEA

I currently teach at Waukee Northwest High School in my 12th year teaching high school math. I also teach Statistics for Upper Iowa University. I love the balance of challenging and guiding high school students as they learn mathematical principles, while also helping to equip future educators to effectively teach mathematics. Being a member of both NCTM and ICTM is so valuable to me as I continue improving my own teaching practice and connecting with other educators that are passionate about improving mathematics education, as well. My most recent professional accomplishment is achieving National Board certification in 2021! While not in the classroom, I enjoy coaching football and track, as well as spending time camping and biking with my family.

Deb Little, Regional Director, Central Rivers AEA

Being one of the few elementary teachers on the board, I bring a different perspective. I understand what it is like to try to teach all of the content areas well-- including mathematics. Currently, I teach fourth grade in Denver, Iowa. I have also taught first, second, fifth, and sixth grades. Teaching mathematics is my favorite part of the day. In my classroom, I encourage students to trust in their mathematical thinking and to share their strategies and reasoning with one another as they engage in problem solving activities. As a practitioner, I am constantly trying to improve my mathematics instruction and welcome opportunities to share and learn through classroom observations/learning labs, discussions on social media, conferences, etc. Please contact me through email: or on Twitter: @Mrs_Little_17. I look forward to the opportunity to share and learn together with you!

Chandra McMahon, Regional Director, Prairie Lakes AEA

This is my twenty-fourth year teaching high school math in Iowa; the last 18 years I have been at Humboldt High School.  I have taught everything from the lowest level high school math class to AP Calculus.  I have been a member of ICTM and NTCM for 17 years.  I love teaching math and seeing students get excited when they understand.  I love the patterns and relationships that math allows us to see. My husband and I have three adult children.  We have two children that live in the Black Hills and enjoy going to see them. Besides visiting our children, I enjoy quilting and reading.

Shannon Pasgovel, Regional Director, Mississippi Bend AEA 

I was born and raised in a small town, Wilton, Iowa. My husband, 2 children, and German Shepherd live on our 3rd generation hog and grain farm in rural Tipton. I enjoy learning new things, collaborating with others, and watching suspense/dramas on Netflix.

I earned my AA degree from Muscatine Community College, BA from the University of Northern Iowa and MA from Drake University. I began my teaching career in Davenport at Sudlow Intermediate teaching 7th & 8th grade students Mathematics for 10 years. Currently, I am a PreK-12 Educational Consultant with the Mississippi Bend Area Education Agency, MBAEA. As a consultant I have the opportunity to do what I love, be sociable and a leader because in this position it's all about networking and problem solving with and for individuals, teams, and systems. I’ve been in education for 18 years and a member of the ICTM, IA-NCSM, IA Core Advocates, NCTM, and NCSM. I’ve had the honor to serve on our ICTM board for the past 2 years.

Valerie Sitzmann, Regional Director, Northwest AEA

Hello! I have been an Iowa educator for 27 years (24 years in a middle school classroom and 3 years as a Math Consultant for NWAEA). In the classroom, I enjoyed the challenge of making all students feel like they were mathematicians as well as assisting all students to be successful with math. As an educational consultant, I now get to share my love of math with other educators and get the privilege to work with students of all ages.

I am a relatively new member of the ICTM Board, only serving 3 years, but I have been a longtime ICTM and NCTM member; I am also an Iowa Core Advocate and a member of the State Math Leadership Team. Getting to meet and work with other math educators from across the state and meet leaders in mathematics education has been the highlight of my time on the ICTM Board.

I live with my husband in an empty nest in Kingsley. We enjoy golfing, home improvement projects, spending time at the lake, and traveling to national parks.

Stephanie Steines, Regional Director, Keystone AEA

I started my career in 1998 teaching science at a small high school in southern Minnesota. Three short years later I started the job I have held since then teaching mathematics, my real passion, at Decorah High School. Over the years I have taught a variety of courses including Algebra, Algebra 2, FST (Functions, Statistics and Trigonometry), Precalculus, and AP Statistics. My goal in the classroom is to create an active learning environment in which my students are engaged in discourse with one another to develop mathematical understanding. I encourage a growth mindset and learning from mistakes to build a stronger understanding of the concepts involved. I have been a member of ICTM and NCTM for many years and have participated in the AP Statistics Reading every summer since 2014. Away from school I enjoy reading, singing, watching movies with my husband, and following my four children in their many and varied activities.

Julie Yurko, Regional Director, Great Prairie AEA

What I teach:  K-12 Math Instructional Coach for Fort Madison SchoolsWhy Math:  Honestly, I hated math until I was in High School.  There I had teachers who challenged me and helped me see the importance of math in real life.  From then on, I saw math as a fun and challenging puzzle just waiting to be pondered. I love being a part of ICTM...hanging out with these hard-working, like-minded math people is a great way to keep up on the latest in Iowa Math!  When I’m not at school or learning more about math and Instructional Coaching, you might find me quilting, hiking, or rooting on my beloved St. Louis Cardinals (GO CARDS!).

Regional Director, Green Hills AEA

(open position)

Appointed Board Members

Marty Beck, NCTM Representative

While I started my teaching career as an 8th-grade language arts teacher, I found my passion when I was able to shift to teaching mathematics. After two decades as a nomad military family, my husband, dog and I have found our home in Bettendorf, Iowa where I am currently the Math Curriculum & Professional Development Teacher Leader for the district as part of the TLC program. It is a good thing that I am a PD junkie myself because, in this PK-12 position, I’ve had a great deal to learn about teaching mathematics in the elementary school. Working with teachers to help them learn to love teaching math and instill that love of mathematics in students is extremely rewarding.

Outside of work, I serve as the representative to NCTM from our Iowa Council of Teachers of Mathematics as well as the immediate past president of the newly formed Iowa-NCSM, an affiliate of NCSM, the national organization for math leaders. My hobbies include leading a Girl Scout troop of 6th-12th grade girls and a GS day camp every June, camping, biking, reading, doing puzzles, and traveling, especially to visit our three children who have left the nest.

Vicki Hamdorf, Communications Coordinator

I am a retired mathematics teacher with 34 years of experience teaching grades 6-12. I served on the ICTM board for 3 years. Since retiring, I have been working at the Iowa Center for Interdisciplinary Training to promote the Basketball Data Analytics Battles. I recently started Health Coaching and I am a caretaker too! I have 4 daughters and 7 grandchildren that I enjoy spending time with.

I love mathematics, I love teaching, and I am not ready to be done yet! I enjoy promoting mathematics and being a mentor for young math teachers. I love learning too!

Ji-Yeong I, Government Relations Coordinator

I currently teach secondary and K-12 mathematics methods courses and an online course about teaching mathematics for Emergent Bilinguals at Iowa State University. I am a teacher educator, educational researcher, and book writer. I earned a bachelor’s degree in astronomy in South Korea, a master’s degree in mathematics, and a Ph.D. degree in mathematics education at the University of Missouri. My research is about effective mathematical pedagogy for culturally and linguistically diverse learners, especially Emergent bilingual students, and helping teachers support emergent bilinguals in mathematical learning. Before I work at higher education, I taught mathematics and science at middle and high schools in California. I have been an NCTM member since 2008 and a founder and faculty advisor of Equipping Mathematics Teachers (EMT), the NCTM student affiliate at Iowa State University.

Marci Ostmeyer, Membership and Affiliate Relations Committee (MARC) Representative (Central 2):

Marci began her career in education as a 4th grade teacher and later transitioned to teaching middle school and high school mathematics. Marci is currently the Professional Development Director at Educational Service Unit 7 in Columbus, Nebraska. Through her role, Marci coordinates her department to support nineteen public schools across the ESU 7 service area. Marci also serves as the math specialist for ESU 7, assisting school district teachers and administrators with teaching mathematics and selecting high quality instructional materials. 

In 2020, Marci began her service on NCTM’s Membership and Affiliate Relations Committee (MARC) where she serves as a liaison for the Central 2 Region (Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota, South Dakota & Wisconsin).

Marci and her husband Rance have three awesome children, two incredible daughters-in law, and four amazing grandchildren. They enjoy traveling, spoiling grandchildren, and taking long drives with no particular destination in mind. Marci has only lived in Kansas and Nebraska, but has a love for watching the ocean waves roll in whenever she gets the chance to visit Hawaii or California.

Wendy Weber, Website Coordinator

 I have been teaching mathematics and future mathematics teachers at Central College for over 20 years. All courses I teach are my favorites and include Calculus, Geometry, Mathematics Seminar, and Mathematics for Elementary Teachers.  I especially enjoy teaching reading, writing, and speaking mathematics in our Mathematics Seminar. ICTM is a great organization to share new ways to teach mathematics -- I love going to the conference every year, learning new pedagogies and connecting with past students who are now colleagues.

To satisfy my artistic side, I do counted cross-stitch.  I’m working on a geometric design that I can't wait to hang in my office at Central College.  Outside of work, I enjoy spending time with my son, Jonathan, and husband, Tom.  

Caitlyn Gilbert, Student Representative

I am a student at University of Northern Iowa. I chose to attend UNI as it is known to be a great teaching school and it was close to home. I have wanted to be a teacher since I was little and once I started to take higher level math courses I knew I wanted to teach math specifically. I would love to teach at the high school level as that’s when I fell in love with math. My goal as a future teacher is to create a positive environment for my students to feel comfortable in asking questions and better understanding math. I would like to establish a good foundation for my students with their knowledge of math so they can build off of it in future classes. I plan to student teach in the spring of 2024. I am still learning what it takes to be a great teacher and can’t wait until I can use my knowledge in the real world!

Iowa DE Mathematics Representative

(open position)

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