Senior Management


Gregg Fleisher serves as Reasoning Mind’s President and CEO. He started his career as an actuary and then switched careers to pursue his passion for education and became a high school math teacher. In 2000, Gregg started AP Strategies, a nonprofit that served Texas school districts in dramatically increasing student performance in math, science and English. Most recently, Gregg served as President of the National Math and Science Initiative, a national nonprofit serving over 500 school districts. In his spare time, Gregg enjoys running and creating new adventures with his family.

Gregg Fleisher headshot
Photograph of Alex Khachatryan.

ALEXANDER R. KHACHATRYAN Co-Founder and Chief Product Officer

If Reasoning Mind is a team of scholars, Alex is our dean. He co-founded Reasoning Mind with his family in 2000 and continues to lead the charge toward making our mission a reality. After immigrating to the U.S. from the former Soviet Union as a refugee, Alex led Texas A&M’s artificial intelligence lab before going on to run a successful consulting firm with his wife, Julia. He holds a bachelor’s and a master’s degree in mathematics from the Moscow Oil and Gas Institute and a doctorate in physics from Moscow State University. After mathematics, Alex’s favorite creative pastime is dramatic theatre.

JULIA KHACHATRYAN Co-Founder and Senior VP

Our organization’s creative maestro, Julia has played a central role in Reasoning Mind’s success from the beginning. Wearing many hats, Julia oversees program usability and quality control, and also leads our art and design functions—filling our programs (and our office) with the creative spirit.  Her team of talented artists, designers, and voice actors ensures our students are captivated by math. Julia has a bachelor’s and a master’s degree in petroleum engineering from the Moscow Oil and Gas Institute, and began her career as a research scientist, authoring numerous technical papers. In her spare time, Julia enjoys gardening, cooking, reading, and teaching her brilliant poodle—Toozik—new tricks.

Photograph of Julia Khachatryan.
Photograph of Tim Tarrillion.

TIM TARRILLION Chief Operating Officer and VP of Finance

Tim is Reasoning Mind’s numbers and operations guru, bringing more than 35 years of management experience and expertise to the team. After a successful career growing various other companies and organizations as their founder, CEO, COO, or other senior management member, Tim decided to apply his skills in an area he’s passionate about: STEM education. When he’s not working, Tim enjoys spending time with his family, improving his golf game, and designing residential homes as an amateur architect. He holds a chemical engineering degree from Rice University and an M.B.A. from Harvard.

YURI BELIKOV Chief System Architect and VP of Software Development

Yuri is Reasoning Mind’s IT-maven, overseeing all aspects of our software development and technology infrastructure. Yuri started as a software engineer in 1996, and has worked as a project manager, software development manager, and software architect. Yuri likes to solve complex math problems and riddles, especially in geometry, and enjoys helping his children learn math. When he’s not working, Yuri spends his time away from the computer reading classic literature, doing handiwork on his family country-house, and playing sports with his three children.

Photograph of Yuri Belikov.
Headshot of Reasoning Mind's Vice President of Development, Renee White.

RENÉE WHITE VP of Development

Reasoning Mind’s fundraising phenom, Renée oversees the donor partnerships that help make our programs possible. Prior to joining the team, she held leadership positions at several education organizations, including Partners in School Innovation, MIND Research Institute, and the “I Have a Dream” Foundation, among others. She holds an M.P.A. from Penn State and a bachelor’s degree in Politics, Values, and Social Change from the University of Washington. In her spare time, Renée enjoys traveling with her family and acting as a Girl Scout Co-Troop Leader for her daughter’s Junior Troop.

ANDREY ROMASHOV VP of Curriculum Development

Turning out pedagogically top-notch math programs is no easy task, but Andrey tackles this challenge with gusto. As VP of Curriculum Development, Andrey assembles and oversees a team of mathematicians, master teachers, and pedagogy experts in their collaborative effort to produce the best possible math content for students. With two degrees in applied math and physics, Andrey is passionate both about the subject matter and the necessity of bringing quality instruction to more students. He’s also Reasoning Mind’s reigning table tennis champion.

Photograph of Andrey Romashov.
Photograph of Konstantin Guarian

KONSTANTIN GUARIAN Head of Moscow Branch

Konstantin heads Reasoning Mind’s Moscow branch, where much of the organization’s software development is conducted. He handles the office’s business, personnel, and accounting activities. In addition to his management specialties, Konstantin holds a bachelor’s, master’s, and doctorate degree in computer science, and has published nearly 40 professional articles on computer networks, database management systems, and artificial intelligence.  A renaissance man, Konstantin enjoys world travel (Italy is his favorite destination), the theater, and photography.


Photograph of Tess Carrithers

Tess Carrithers
Director of Tutoring
Photograph of Monique Lord.

Monique Lord
Director of Human Resources
Photograph of Nathaniel Rounds.

Nathaniel Rounds
Director of Knowledge Engineering
Julia Trabert

Julia Trabert
Director of Product & Project Support

Regional Leadership

Photograph of Audrey Pitonak-Goff.

Audrey Pitonak-Goff
Executive Director for West Virginia
Photo of Adam Powell, Reasoning Mind's Executive Director for North Texas.

Adam Powell
Executive Director for North Texas
Photograph of James Talarico.

James Talarico
Executive Director for Central Texas