Our Team

We’re a small team of passionate GMAT® teachers who do big things for their students. We offer a unique online self-study course that helps students master the quantitative section of the GMAT® as well as personalized GMAT® tutoring to students anywhere in the world using Skype and WebEx. When you work with us, you’re working with a motivated team that is fully invested in the success of its students. We’ll do everything we can to help you earn the highest GMAT® score possible.

Scott Woodbury-Stewart


Scott began his career in education by teaching physics, chemistry, math, and biology. Along the way, he developed a love for helping students excel on standardized tests, and for more than a decade now, Scott has been helping students achieve impressive GMAT scores.

Scott is an adventure seeker who enjoys overcoming challenges. He has piloted planes through the Bermuda Triangle, been scuba diving with Great White Sharks, run the Boston Marathon, and earned a Shodan (Black Belt) in Bujinkan Ninjutsu. His greatest thrill, however, has come from helping his students overcome obstacles to attending the professional schools of their choice.

A passionate teacher who is deeply invested in the success of his students, Scott goes far beyond his students’ expectations in providing them with precise knowledge and usable skills. Scott has helped a wide range of people from all around the world achieve their goals and has logged more than 10,000 hours of GMAT instruction with students from places as diverse as the U.S. and Colombia, the UK and Turkey, Australia and India and most places in between.

Scott’s students characteristically develop a deep mastery of the material tested on the GMAT, because he excels in demonstrating to his students that on the GMAT, as well as in life, simplicity is king, that when they seek simple solutions to complex problems, magical things happen.

Scott founded Target Test Prep and served as the lead content developer and curriculum architect for Target Test Prep GMAT Quant, a revolutionary new GMAT course that provides students with a unique competitive advantage on the quant section of the GMAT. Having written over 3,000 realistic practice questions for GMAT quant study and close to 2,000 pages of GMAT quant instructional content, Scott has a deep understanding of the knowledge, skills, and techniques a student needs in order to achieve a high GMAT score. As a consequence, he has been able to provide a steady stream of students to the world’s top business schools, including HBS, Stanford, Wharton, Booth, and Sloan.

Jeffrey Miller

Head of GMAT instruction & COO

Jeff likes to think of himself as an average guy who does above average things for the GMAT students to whom he has dedicated his efforts. After graduating from Washington and Lee in 2004 with a degree in history, Jeff began his career on Wall Street, where he got his first taste of standardized exams—passing the series 7, 63, and 66 tests before setting his sights on an MBA program.

In 2007, Jeff discovered a love for teaching and for helping students earn top GMAT scores. Rather than continue to pursue business school, Jeff helped launch Target Test Prep. Since then, Jeff has successfully logged over 10,000 hours of GMAT tutoring. From his home in Brooklyn, with support from his cat/officemate Edward, he has tutored students from all over the world. He is proud to say that his students have attended many of the top business schools across the globe and that some of these students have even managed to outscore him on the GMAT. In addition to developing his skills as a master GMAT tutor, Jeff has spent years assisting in the creation of Target Test Prep’s unique GMAT math curriculum—the cornerstone of Target Test Prep.

During those years of writing and solving thousands of GMAT practice questions, Jeff has learned to think like the test makers; this keen insight helps his students gain a solid understanding of exactly what issues the GMAT questions are engineered to test. Jeff is also a master performance coach who helps his students develop a winning mindset. Since Jeff was once a GMAT student himself, he understands that hard work and dedication are critical elements to one’s success on the GMAT.

When Jeff is not tutoring (which is not often) he likes to be outside, running and biking in Prospect Park with his wife Catherine. Jeff also likes to exercise his coaching skills in arenas other than standardized exams. Drawing on his experience of playing lacrosse in both high school and college, he has spent time teaching the sport to youth in New York City. He hopes to one day coach a high school team in Brooklyn.

Amaury Peniche Gonzalez


Amaury is an experienced systems engineer, production engineer, and computer scientist with extensive experience in front- and back-end development, computer networking, and project management.

Previously, Amaury worked as a consultant and project manager for Ernst & Young and as a senior engineer for TopTal. In addition, Amaury co-founded the Colombian auction site Melollevo.co.

Amaury has a profound personal interest in virtual reality and has published and presented numerous academic papers in this discipline including: "An Interactive Cutting Algorithm with Pattern Recognition for Triangular Meshes" at the 2009 International Conference on Computer Graphics and Virtual Reality (CGVR '09) in Las Vegas, NV, "An Immersive Virtual Reality Training System for Mechanical Assembly" at the 4th International Conference on Manufacturing Engineering, Quality and Production Systems (MEQAPS '11) in Barcelona, Spain, and "Combining Virtual and Augmented Reality to Improve the Mechanical Assembly Training Process in Manufacturing" at the 6th WSEAS International Conference on Computer Engineering and Applications (CEA '12) at Harvard University.

Amaury graduated with honors in systems engineering, production engineering, and computer science from EAFIT University.

Rafael Perez


At TTP, Rafael helps turn revolutionary ideas into powerful user experiences that help our students learn more efficiently and effectively.

Rafael spends his time between France and Colombia. He’s a Production Engineer graduate of EAFIT University, in Medellin and a Production and Mechanical Engineer graduate of l’Ecole Nationale d’Ingénieurs de Metz, where he also obtained a Masters in Logistics and Quality, and a Six Sigma Green Belt certification.

Rafael has a passion for travelling (he’s always thinking of his next trip), and he loves hiking and camping. His greatest life experience to date was a 600-mile walk from France to Fisterra, Spain. One of his dreams is to walk the Pacific Crest Trail. Rafael also likes motorbike riding – or simply enjoying a big cup of coffee while reading a book in a peaceful place.