Mrs. Lalita Trehan is a renowned Montessorian, teacher and teacher trainer in the U.S.A. She has been an educator for over 28 years and during this time has served many roles. She has a B.Sc. in Home Economics from Lady Irwin College, New Delhi. In 1978, she received her pre-primary Montessori Certification from Chicago and in 1989 lower and Upper Elementary certification from Houston, Texas. In 1993, she became teacher trainer at Houston Montessori Centre.

Mrs. Trehan is founder of First Step Montessori School (Panchkula, 1983) and Founder Director of American Montessori School (U.S.A., 1986), Sugar Creek Montessori School (Stafford, U.S.A., 1994), Cambridge Montessori School (U.S.A., 1997) and Sugar Creek Montessori School (Katy, U.S.A., 2007). As testament to her expertise in 1999, Mr.Untermeyer, Chief of Staff under President George Bush Sr. and Chairman of Texas State Board of Education, personally requested Mrs. Trehan to serve as trustee on the board of the Texas Centre for Educational Research (T.C.E.R).