At LPS, we know that the quality of instruction plays a key role in a student’s academic success, and that excellent teachers motivate students to strive for excellence. Our highly skilled and experienced, professional faculty takes an active interest in both developing dynamic curricular materials, and meeting the unique needs of all of our students.

Our teachers:

  • Hold advanced professional degrees from elite U.S. universities, including Harvard, MIT, Boston College, and the University of Texas
  • Communicate passion for their subject matter
  • Engage students with highly interactive teaching methods
  • Have demonstrated success teaching international students and non-native speakers of English
  • Enjoy helping adolescents reach their educational goals

All LPS teachers are native speakers of English. Many have lived and taught in international environments as well as within the U.S., giving them special insight into the experiences of international students.

Ms. Traci Alvelo
Director of School
Ms. Alvelo has rich knowledge of American independent schools, the needs of boarding students and the challenges of international students gained through various leadership positions she held at institutions such as Chapel Hill-Chauncy Hall School in Waltham, MA and Hargrave Military Academy in Chatham, VA. Her deep passion for helping students, rich knowledge of educational services and business management background positions her well for facilitating continued success and growth of Lexington Prep School’s rigorous and innovative programs. She is raising her four sons along with her husband, Carlos, a Spanish faculty at Lexington Christian Academy.

Ms. Emily Kim
Director of International Relations
Ms. Kim brings decades of experience to her position as Director of International Relations of LPS. Graduating from the Massachusetts College of Pharmacy in 1993, she worked in the pharmaceutical field for some 15 years. During that time, she devoted herself not only to her career, but also comprehensively to her own children’s education. Being a particularly involved and informed parent enabled her to learn a great deal about schools and the application process at each educational level. Interest in her own children’s education grew into a passion and proficiency in helping other students as well.

Ms. Kim decided to join LPS in 2007 to further explore her interest and ability in the educational field. She is expert in consulting, placement, academic advising, and secondary education liaise. She finds it particularly rewarding to assist students and their families in pursuing personal and academic success, with a focus on issues unique to international students. Her role currently serves as a support to the Office of Admission at Lexington Christian Academy.

Mr. Samuel Ko
Academic Director
Sam began working at Lexington Prep School in March 2015 as an SAT instructor, where he also taught ACT, SSAT, and TOEFL; in May 2016, he took the position as academic director. Sam has prior experience teaching, working with (international) students, standardized testing, and college counseling. He has also worked abroad in Korea as an official SAT essay grader, and has worked as the editor for several, published standardized test books. Sam also has experience teaching middle and high school English, Math, and Spanish in the United States, and a variety of other subjects in South Korea, Bolivia, MIT, Bunker Hill Community College, and MATCH Public Charter High School. Sam graduated from Boston College cum laude in with a major  in English at the College of Arts and Sciences and a major in Applied Psychology & Human Development at the Lynch School of Education; he graduated from Harvard with a master’s degree in Religion Literature, and Culture. Sam hopes that his experiences will be able to help and serve students from around the world who aspire to matriculate in the United States.

Mr. Sam S. Jwa
SAT/SSAT/SAT2 Math Instructor
Mr. Jwa has a strong interest in developmental mathematics. He obtained his M.A. Degree in Mathematics from the University of Texas at Austin, where he taught advanced Calculus, Business Calculus, and Algebra for three years. He also earned his M.S. Degree in Electrical and Computer Engineering from UT Austin, and a B.S. Degree in Electrical Engineering from Yonsei University, Seoul, Korea. His work experience includes computer programming and mathematical applications at Samsung in Seoul, Korea, and the Air Force Research Lab in Dayton, OH. He has been applying his problem solving skills to help many students succeed in SAT, SAT2 Math, Calculus AB/BC, etc. He truly loves mathematics and loves to help students with this beautiful subject.

Ms. Sarah Ko
SAT/SSAT English Instructor
Ms. Ko has a BA in English from Boston College as well as a MA in Teaching from Fordham University. She has been teaching in the public and charter school systems for the past 5 years in New York and Massachusetts. She has had extensive experience tutoring and offering test prep help for nearly 10 years working with organizations such as Let’s Get Ready, MATCH Charter Schools, and English Math Academy. She has worked with students from ages 5-17 on a variety of content areas and skills, but mostly in English language and literature. She is excited to share her experience and expertise with the students at LPS.

Mr. David Seong Won Kim
TOEFL/SSAT Instructor
Mr. Kim received his bachelor’s degrees in English Language & Literature and International Studies at Korea University. He also holds a Masters in Divinity from Gordon-Conwell Theological Seminary. Mr. Kim has worked as a private English instructor for all age levels seeking to study abroad or enroll in international schools, and he has also worked at the Manhattan Language Institute in Seoul as a speaking instructor focusing on college and job interviews in English. He has experience teaching test prep courses, and as he understands the difficulty of learning another language and preparing for competitive schools, he hopes to assist the learning experience for not only international but also all secondary students.

Ms. Janis Melvold, Ph.D.
College Counseling
Dr. Melvold earned her Ph.D. in Linguistics from MIT in 1990 and taught courses in linguistics and reading at the Harvard Graduate School of Education (1989-91). She worked as a research associate in the field of neurolinguistics at Mass. General Hospital/Harvard Medical School from 1993 to 1999, studying language disorders. Since 1999, she has been teaching for the Writing and Humanistic Studies department at MIT and also teaches undergraduate courses in scientific writing. She also serves as a writing adviser for courses in Biology, Engineering, and Management.

Ms. Denise Frame Harlan
Writing/College Essay Instructor
During the school year, Denise Frame Harlan teaches The Great Conversation: Gordon College’s first-year writing course. In addition, Denise helps high school students to develop powerful, clear college application essays, and she coaches students through the English portions of the SAT. Denise’s story “Smoke Rings” won an honorable mention in Ruminate Magazine’s 2013 nonfiction contest, and she won the 2011 culinary writing fellowship from Dairy Hollow Writers. She holds an MFA in creative writing from Seattle Pacific University.

Mr. Tim King
English Instructor
Mr. King holds bachelor’s degrees from Boston University in Philosophy and Political Science. He also holds a master’s 
 degree in Linguistics from the University of Massachusetts, Boston. Mr. King has lived and worked in China, Japan, and South Korea. This work has included teaching at a university, a conversational English school, an international business English institute, and a test-prep academy. In addition, Mr. King has taught a variety of students from all over the world at many English academies in the Boston area. He worked as a program director at an international refugee center in 
Boston, serving refugees and asylum-seekers from many countries by helping them learn English and develop career skills. During his career in education, Mr. King has tutored students from grade school through college and beyond,  developed curricula, managed teachers and staff, developed and taught teacher-training programs, and prepared students to excel on a wide variety of standardized tests.