Charles Bibilos, founder
Charles Bibilos is one of the world’s most accomplished independent GMAT instructors, with more than 15 years of experience as a classroom teacher and private tutor. Read more
Charles has worked professionally as a teacher since 1999, and began focusing primarily on the GMAT while working for a major test-prep firm in 2002. Since 2003, Charles has tutored independently in San Francisco, Washington D.C., New York City, and Denver, and he has worked with online GMAT and GRE test-takers in more than 35 countries.
Charles graduated with distinction from Stanford University, and earned a perfect score of 800 (51Q/51V/6.0 AWA) on the GMAT in July 2011. Charles is a master test-taker with a Master’s degree in Education, and he has earned perfect scores on the ACT, the math SAT, and the GRE. Charles prides himself on being a versatile, charismatic, and empathic teacher, and specializes in assisting students who have struggled to achieve results through mass-market GMAT test-prep courses or GMAT self-study programs.
In conjunction with his efforts to help students with standardized testing, Charles has also developed a deep understanding of college and MBA admissions processes, and has worked with hundreds of students on their MBA application essays, interview skills, and resumes. He has helped applicants gain admission to nearly every elite MBA program, including Stanford, Harvard, Wharton, Columbia, Booth, INSEAD, Cornell, Kellogg, and MIT Sloan, among many others.
In addition to his efforts as a GRE and GMAT tutor, Charles is an accomplished writer who has published two full-length TOEFL books, and he has contributed to economics, art history, ESL, and ornithology textbooks as a writer and editor. Charles is a former professional dancer, and he has worked or studied in South Korea, Russia, Chile, Mexico, and Ecuador. In his spare time, Charles loves to travel, write, exercise, ski, hike, argue about economics, and eat massive quantities of international food.
Michael Maietta, GMAT Ninja’s latest addition, is a rare species: a former engineer with incredible verbal, interpersonal, and pedagogical skills. Read more
Michael graduated summa cum laude in Mechanical Engineering from Boston University, where he first began to develop his passion for teaching and tutoring. After interrupting his tutoring career with several successful years at a major consulting firm, Michael began tutoring full-time in 2015, and joined GMAT Ninja in 2016.
Michael is the son of two lifelong educators, and he excels at helping students build both their underlying skills and their confidence with the GMAT. Michael also strikes a masterful balance between being a genuinely nice guy and being a brutally honest tutor: he’ll always tell you what you need to hear about your GMAT progress – even if it’s not necessarily what you want to hear. And despite his quantitative academic training, Michael serves as one of GMAT Club’s resident GMAT verbal experts.
Outside of his life as a tutor, Michael is an avid traveler who visited 19 countries. He has worked in Chile and in Colombia, where he experienced a torrid love affair with ajiaco, obleas, and empanadas. Michael also enjoys surfing, snowboarding, hiking, cycling, and recording his own guitar music.