Second Act is Education Publica’s column on professionals who reinvent themselves after retirement or at major turning points in life. In the previous issue, former Bell Labs researcher Sudhir M. Ambedkar recounted his journey from IIT Bombay and the University of California, Berkeley to nearly three decades of research and innovation at Bell Labs. In this concluding part, he reflects on how retirement opened the door to an equally rewarding second career—as a mathematics teacher, mentor and lifelong learner.
In the previous part of my story, I described how retirement led me to pursue certification as a high school mathematics teacher after my career at Bell Labs. Standing in a classroom for the first time as a teacher marked the beginning of an entirely new chapter in my life.
After completing my certification, I taught mathematics full-time for about seven years. Teaching mathematics in the United States was a new experience for me, and it took some time to adjust to a different way of teaching. While teaching, I learned a few things about some fundamental mathematics concepts that I had never thought about before.
I used a hybrid approach, combining the Indian method and the American method of teaching mathematics. During my tenure as a teacher, I made several observations about the education system where I was teaching, although many of them were generally applicable to the education system in New Jersey as well. I documented those observations in a white paper and sent them to a few education professors at major universities. Some agreed with my observations but said I could not publish the paper in an academic journal because I was not an education researcher.
One observation was the amount of repetition in the curriculum across Algebra I, Algebra II and Pre-Calculus. I felt it would be better to build a stronger foundation in the earlier stages rather than repeat many of the same topics in subsequent courses.
I also noticed that calculators were introduced in very early grades. As a result, many students became overly dependent on them and often lacked the ability to perform mental mathematics. I believe it is important to build a strong understanding of basic mathematical operations and concepts—including addition, subtraction, multiplication, division, fractions and solving equations—before relying heavily on technology.
The mathematics textbooks used in American schools are excellent. They contain colourful illustrations, graphics and worked examples that make concepts easier to understand. At the same time, students often expected teachers to explain every step in detail, rather than working through some of the reasoning independently.
Another aspect that interested me was the grading system. Homework and classwork accounted for a significant portion of students’ grades, while tests and quizzes carried comparatively less weight. In my opinion, this did not always accurately reflect a student’s mathematical skills and knowledge.
The students hardly ever received failing grades, and almost everyone progressed to the next level. On one occasion, I was under pressure to pass a student so that the school could maintain a 100 per cent graduation rate—a highly valued performance indicator.
These observations are not intended as criticism of the education system, but simply to illustrate how it differed from the one I had experienced in India. Bright students always rise to the top in this system as well.
I thoroughly enjoyed teaching, and it was gratifying to see students succeed and gain admission to excellent universities. Unlike research, where results often take years to become visible, I could see the impact of my work immediately.
After about seven years of teaching, I underwent knee surgery. As a result, I gave up classroom teaching and began focusing more seriously on preparing students for the SAT and ACT, the standardised tests widely used for college admissions in the United States.
I worked with two learning centres that referred students to me for SAT and ACT coaching. Over the years, both examinations changed considerably in their format and content, so I had to keep up with those changes and adjust my teaching accordingly.
Initially, I taught students in person. During the COVID-19 pandemic, all instruction shifted to Zoom. Even after the pandemic, I continued teaching online because, since most of my classes were one-to-one, I found Zoom to be both efficient and physically less demanding.
As a result of teaching these examinations, I developed several practical strategies that enabled students to complete the tests accurately within the allotted time. Some students later told me they found these strategies useful not only in the SAT and ACT but also in their regular mathematics and English classes.
I eventually published these strategies as a series of guidebooks on Amazon. The feedback from students and parents has been consistently encouraging.
In terms of years, my teaching career has now lasted about 75 per cent as long as my engineering career. In both professions, I could see the results of my work, but teaching has been more gratifying because I had direct contact with the people who benefited from it.
I expect to continue this second career for as long as possible.
Sudhir M. Ambedkar is a mechanical engineer trained at IIT Bombay and the University of California, Berkeley. He spent nearly three decades at Bell Labs working in telecommunications research and development. After retirement, he became a certified mathematics teacher and now tutors students preparing for the SAT and ACT while authoring test-preparation guides.