“In my role as a trainer of teachers, I am keenly aware of what constitutes effective instruction…[and] as an educator, I recognized and experienced first-hand the excellence of Marcelo’s instruction…..[He] has the ability to explain grammatical concepts with great clarity…he constructed excellent visuals which helped me comprehend and use the new learning. Equally effective was his insistence that all newly learned grammar be applied in conversation….It is my belief that [he] is an outstanding instructor, one of the finest I have encountered in my work as an educator.”