Expanding Math Opportunities for Every Student in Chicago

Doug O'Roark

Doug spent the last decade leading the Math Circles of Chicago, which has grown to be the largest math enrichment program in the US. Previously Doug led the NSF-sponsored AIM-TRU research project at DePaul, which worked to improve math teaching across CPS. He also founded and led the secondary math component of the UChicago Urban Teacher Education Program and was the 1st teacher hired at Payton HS. He was awarded the Radio Shack National Teacher Award, the MAA’s Sliffe Award for Distinguished Math Teaching, the ICTM Rine Secondary Math Teaching Award, and the Museum of Math's 2020 Rosenthal Prize for Innovation and Inspiration in Math Teaching. The City of Chicago Math League and Payton Prep have awards named in his honor. He lives in the South Loop neighborhood with his wife, a researcher at UIC; both of their children are graduates of CPS. ‍

Michelle Harton

Michelle taught for 13 years at Morgan Park High School in CPS. Michelle has a bachelor’s degree in Electrical Engineering from Tennessee State University (TSU), a master’s degree in Electrical Engineering and Computer Science from the Massachusetts Institute of Technology (MIT), and a Master’s Degree from Northwestern University in Education and Social Policy. For many years, she worked as a research engineer at Motorola. In addition to her love of math, she enjoys reading, traveling, going to the movies, and playing the viola and piano. She is married and has two adult children.

Graham Rosby

Graham loves a good math problem. He's had the good fortune of learning and solving many as a volunteer with Math Circles of Chicago since 2011, and as a student at the University of Chicago (AB '11) and Harvard's Graduate School of Education (MA '18). He grew up in the Ukrainian Village neighborhood of Chicago, and now lives in Bucktown with his wife, a veteran CPS teacher, and son. He also enjoys long distance running, crossword puzzles, and quiz shows.

Jessica Young-Eleazar

Jessica is a middle school educator and doctoral student passionate about diversity, equity, and inclusion in education. She holds Illinois teaching endorsements in Math, Language Arts, and Music, and is pursuing her EdD at Loyola University Chicago. As a Filipino-Chinese American, Jessica works to design learning experiences that reflect students’ identities and empower them as social justice advocates. You can usually find her at DivaDance Chicago, trying new restaurants, or hanging out with her partner and their hedgehog, Iggy.

Lauren Sawyer

Lauren is a Middle School Math Lead Teacher + Advisor for a school in West Town. She's an educator of 10 years. She taught as a 3rd - 5th contained classroom teacher and specialized in 3rd - 8th math and science. Outside the classroom she's written math and science curriculum, coached teachers in math, and managed the education program for a city park in Saint Louis. Lauren and her family live on the UChi campus and love to play board games with any free time they have.

Valeria Leiva

Valeria Leiva is a proud Colombian American from South Florida. She has Bachelor's in Elementary Education from Florida Atlantic University. With as an educator, Valeria has always prided herself on connecting with her students and helping them find joy and confidence in mathematics. Valeria is deeply committed to promoting equity in education, ensuring that every student has access to quality learning opportunities. She is a dedicated daughter, loving wife, and devoted dog mom.

Angelica Ledezma

Angelica Ledezma joined Math Circles of Chicago in 2024 as the operations assistant. She has a bachelors in Social Work from Northeastern Illinois University. Outside of Math Circles, she loves to spend time with her family and travel.

Veronica Armendariz

Veronica is excited to join Math Circles of Chicago as a Hub Coordinator, bringing more than 10 years of experience in education, curriculum development, and teacher leadership. A longtime Chicago educator, she is passionate about creating engaging and accessible learning experiences that help students develop confidence, curiosity, and a genuine connection to mathematics. Throughout her career, Veronica has taught mathematics, developed curriculum, mentored educators, and facilitated professional learning. In her new role, she looks forward to building strong relationships with students, families, educators, and community partners while helping expand joyful and meaningful math experiences across Chicago.

Patrick Beatty

Patrick Joined match circles of Chicago in 2024 as the site coordinator at Payton College Prep. Patrick has been a paraprofessional at Payton since 2022 and did his undergraduate in history at North Central College and his masters in education at National Louis University in Chicago. When not working with students Patrick enjoys traveling, reading about other cultures, listening to podcasts, and playing video games.

Barbara Manjarraz

Barbara has been a math teacher at Back of the Yards College Prep since the school opened in 2013, teaching a variety of International Baccalaureate courses. Barbara graduated from St. Olaf College in Minnesota with a bachelor’s in mathematics. Outside of math, she loves coaching badminton, spending time with her two children at soccer and baseball games, traveling, and spending any spare moment in Minnesota with her family!

Almasa Burnell

Almasa Burnell has been with Math Circles of Chicago since the spring of 2022. Since 2018 she has taught Calculus and Algebra II at Lane Tech. In her spare time she enjoys going to concerts around the city of Chicago, walking along the lakefront while listening to audio books, and spending time with the people closest to her!

Mat Wimberly

Mat is currently the Business Coordinator for the Math Department at the University of Chicago. He moved to Chicago in 2016 after completing his B.S. at The University of Alabama and recently completed his M.S. Degree at Drexel University. In his spare time, he likes to see plays at Steppenwolf, play Ultimate Frisbee as part of the CMSA league, and spend time with friends exploring the city. He joined the MC2 program in Fall of 2021.

Alexis Stokes

Alexis was a CPS classroom teacher for 19 years, with experience teaching from 2nd grade to 6th grade. Since 2022, she has been a Math Content Specialist in the CPS Department of STEM. Alexis has been connected with Math Circles since 2021, when she ran an after school program at her school in Bronzeville. Outside of work, she enjoys walking, biking, and spending time with family.

Steve McIlrath

Steve lives in the Austin neighborhood with his wife and three children. He's taught at Austin College and Career High School for more than 30 years. Over the last decade he's worked with colleagues on Chicago's west side to build Project Exigent into an intensive summer math program serving middle schoolers and high schoolers. Exigent and Math Circles of Chicago became partners in the winter of 2025.

Gary Jones

Gary Jones is President of Jones Partners, Ltd., an independent consulting firm in the electric power industry. He is a retired Senior Vice President and Owner of Sargent & Lundy, LLC, an international consulting engineering firm in the electric power industry, and served as a Senior Safety Engineer at the International Atomic Energy Agency (IAEA) in Vienna, Austria. He founded the Chicagoland Chapter of Engineers Without Borders (EWB) and has served on several boards of directors for non-profit organizations in the Chicago area, including EWB-Chicago, SALUTE, Inc. (which aids veterans and their families), and the Chicago Chapter of the American Nuclear Society. He also served on the Agassiz Local School Council. He enjoys riding bicycles and geometry, and has a new interest in algorithms.

Sendhil Revuluri

Sendhil Revuluri works to improve opportunity for children in high-need schools. He currently serves as the Vice-President of the CPS Board of Education. He previously traded equity derivatives and helped launch a new public high school in the South Bronx (where he was recognized as a Math for America Master Teacher). He chairs the project committee of the Bright Promises Foundation, was recently elected Vice President of the IMSA Alumni Association and to the Board of the Illinois Council of Teachers of Mathematics and is a Leadership Greater Chicago Fellow. His family lives in Pilsen, where his wife is an executive at a non-profit working to improve the lives and opportunities of people living in poverty, and his son is a kindergartener at a CPS elementary school.

Archana Rana

Archana Rana is mom to two CPS kids and is passionate about making education accessible to all children. Professionally, she works at Mars Incorporated, leading their HR Operations Strategy team. Having spent half her life in India and the United States, she considers herself a global citizen. In her free time, she enjoys cooking foods from around the world. Archana lives in Little Italy with her husband and two children.

Troy Boccelli

Troy Boccelli is a CPS alumnus and lifelong Chicagoan. He became involved with Math Circles through his younger brother, a former Math Circles participant. He works for a real estate developer and asset manager. Troy grew up in Little Village and currently lives on the Near West Side.

Lawrence Tanzman

Lawrence Tanzman is a CPS alumnus and a prior student of two of the founding members of the Math Circles of Chicago. Lawrence works for a financial company in Chicago trading equity derivatives. Lawrence has taught a Math Circle session on mathematics in finance and hosts a Guesstimathon every year at the QED Math Symposium.

Corey Morrison

Corey Morrison is the Director of STEM for Chicago Public Schools. Mr. Morrison has served as a math teacher, department chair, and most recently, the assistant principal of Kenwood Academy where he oversaw the math and science departments. Throughout his career, he has championed creative ways to provide access and opportunities for all students to achieve advanced levels of mathematics. With a passion for helping all students and teachers find their math identity, he is committed to expanding the love of STEM across the district.

Jen Turner

Jennifer Turner is a global human resources, talent and culture executive with over 20 years of experience across a variety of industries including technology, marketing, analytics, professional services and consumer packaged goods. Most recently Jen was the Chief People Officer at Double Good, and prior to that she was the Global Vice President of People Experience at CSG, Inc. A lifelong Chicagoan, Jen earned her Bachelor’s degree from Loyola University Chicago and is involved with a variety of local non-profit organizations that support her hometown. Jen lives in Chicago with her family and their amazing dog, Keno.

Jose Baca

Jose Baca (he/him) was born and raised on Chicago’s South Side to a father from Michoacán and mother from Monterrey. A product of CPS from K-12, he was able to attend the University of Miami after, graduating Cum Laude.

Vishal Shah

Vishal Shah is the CFO for the Payment Services segment at Discover Financial Services. In addition to his experience in the corporate sector, Vishal spent time as a high school math teacher in Washington D.C. as part Teach for America, sparking his passion for math education. Vishal was born and raised in the Chicagoland area, completed his undergraduate and graduate degrees in Chicago and currently resides in the West Loop with his wife and daughter.

Brenna Albert

Brenna Albert is a CPA with extensive executive leadership experience in accounting and finance. Brenna is a lifelong learner who holds an MBA from the University of Chicago, MAcc from East Tennessee State University, and a BS and BA from the University of Southern California in General Studies (Education) and Mathematics, respectively. Brenna participates in professional organizations and honorary societies, including Chief, the Controllers’ Council, Phi Beta Kappa, Beta Alpha Psi, and Beta Gamma Sigma, and supports several charitable causes. In her free time, she enjoys reading, foreign languages, puzzles, games, hiking, and time with friends and family.

Lisa Penelton

Lisa is a Chicago native and data scientist. Her career has mapped the path from research and statistical methods to evidence-based planning. Lisa’s focus on data literacy enables organizations to reframe and solve complex problems. She sees math engagement as a cornerstone of social mobility and equality. Lisa’s client experience includes Nissan/Infiniti, AT&T, Kaiser Permanente, and SAP. She has held senior positions within CitiGroup, United Way Worldwide and served on the board of the Chicago Community Health Centers. Lisa holds a master’s degree from the Irving B. Harris School at the University of Chicago and a bachelor’s degree from the University of Illinois.

Judith Robb

Judith Robb is an education professional with over 20 years of experience in K–12 and higher education content development. She began her career in publishing with the University of Chicago, contributing to the development of the Everyday Mathematics program, and spent 15 years in Glenview School District 34 as a math and science teacher and Science Facilitator, leading a districtwide initiative to revamp the science curriculum and providing professional development. Judith later served as an Editor and Curriculum Specialist at Pearson, developing print and digital STEM programs. Judith lives in Chicago and works in educational publishing supporting innovative, equitable approaches to teaching and learning.

Eileen Bevis

Eileen Bevis is an experienced audience researcher and strategic consultant, currently leading changes to the employee experience as a Senior Vice President at Northern Trust. She hasn't touched an integral or a matrix since college, yet every day she uses logical reasoning, critical thinking, problem-solving, and communication skills honed during her BA in mathematics. As a 20+ year resident of Chicago and a former educator, she now works with several Chicago-based non-profit organizations to reduce socioeconomic inequality on multiple fronts.