There is a particular kind of authority that comes from doing the work and teaching it at the same time. David Rewcastle occupies that position. He is a Senior Analyst at E3 Research Associates, where he analyzes energy markets and fixed income securities, and he is also an Adjunct Professor of Economics at the University of New Haven, where he teaches the discipline he has spent roughly 35 years practicing. The combination is less common than it might seem, and it shapes the way he approaches both roles.
The Practitioner Who Also Teaches
Many people who teach economics have spent their careers primarily in academia. Many people who analyze markets have spent their careers primarily on the professional side. Rewcastle belongs to a smaller group that does both at once, bringing active market experience into the classroom and the analytical discipline of teaching back into his professional work.
That dual perspective matters. An economics course taught by someone who has spent decades applying economic principles to real markets is a different experience from one taught purely from textbooks. Rewcastle has watched theory meet reality across multiple market cycles, and he has seen where the two align and where they diverge. That is knowledge earned through practice, and it is difficult to replicate from research alone.
Why a Working Analyst Chooses to Teach
Teaching is not a small commitment for someone with an active professional career. It requires preparation, time, and a genuine interest in the development of students. For a practicing analyst to take on an adjunct professorship is a deliberate choice rather than a convenience.
The choice reflects something about how Rewcastle views his field. Economics and financial analysis are disciplines that benefit from being passed on carefully. The next generation of analysts and economists learns not only from formal instruction but from the accumulated judgment of people who have worked through real market conditions. By teaching, Rewcastle contributes to that transfer of knowledge in a direct and lasting way.
The Discipline of Explaining Clearly
There is a well-known idea that you do not fully understand something until you can teach it. For an analyst, the discipline of explaining complex economic and market concepts to students has a sharpening effect on one's own thinking.
Market analysis rewards clarity. An analyst who can explain why energy prices move, or how to evaluate a company, in terms a student can follow is an analyst who has organized that knowledge rigorously in his own mind. The two roles reinforce each other. The teaching demands clarity, and the clarity improves the analysis. Rewcastle has written directly about the analytical side of this work, including his approach to how he evaluates energy companies, and the same structured thinking that serves him in the classroom is evident there.
A Foundation Built Over Decades
The credibility Rewcastle brings to teaching rests on a long and substantive career. Over approximately 35 years, he has focused on energy markets and fixed income securities, developing deep expertise in the sectors he covers. His work earned recognition from The Wall Street Journal, which named him a "Best on the Street" analyst for his coverage of oilfield services.
That professional foundation is also what led him to build his own firm. The story of how he established E3 Research Associates reflects the same independence and analytical conviction that characterizes his broader career, a path he described in his account of how he built E3 Research Associates. An analyst who has built a firm and earned national recognition brings a level of real-world credibility to the classroom that enriches what students take away from it.
Teaching Through a Period of Change
Rewcastle teaches and analyzes at a moment when his field is undergoing significant change. The energy sector in particular is navigating a complex transition, with shifting technologies, evolving policy, and changing patterns of demand. For students entering economics and finance, understanding that kind of change is essential preparation.
An instructor who is actively analyzing these developments in his professional work brings current, grounded perspective to that subject. Rewcastle has shared his own measured view of these shifts, including his analysis of the energy transition, and that kind of firsthand engagement with a changing sector is exactly what makes practitioner-educators valuable. Students learn not just established theory but how a working analyst thinks through developments that are still unfolding.
The Value of Both Roles
David Rewcastle's work as both an analyst and an educator reflects a career built on depth and a willingness to share what he has learned. The analysis informs the teaching, and the teaching sharpens the analysis. For his students at the University of New Haven, the benefit is access to someone who does the work he teaches. For his professional work, the benefit is the clarity and rigor that come from having to explain complex ideas well.
It is a combination that serves both the students who learn from him and the discipline he has spent decades helping to advance.
David Rewcastle is a Senior Analyst at E3 Research Associates and an Adjunct Professor of Economics at the University of New Haven. He has spent approximately 35 years analyzing energy markets and fixed income securities, and was recognized by The Wall Street Journal as a "Best on the Street" analyst for oilfield services coverage. He is based in Darien, Connecticut.
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