By Abbas Kazimi, CEO of Nimbus Therapeutics, as part of the From The Trenches feature of LifeSciVC
There’s a version of leadership that presents cleanly from the outside: the presence in the room, the confidence behind decisions, the sense of steady forward momentum, and clear strategic intent. It’s the version we imagine as we grow toward leadership and in many ways, it’s real.
What I didn’t fully appreciate before stepping into the CEO role at Nimbus was what sits beneath that surface. The same clarity and decisiveness that others experience externally are often built on quieter layers of reflection, responsibility, and the weight of knowing how much rests on each decision and how deeply those decisions are felt by the people around you.
A year into what I consider the privilege of leading Nimbus, I’ve realized that leadership feels very different from the inside. It’s heavier than I expected, quieter than I imagined, and far more personal. It forces you to confront not just how you lead, but why you lead the way you do.
Over the past year, I’ve found myself reflecting not only on our strategy after 16 years in leading computational chemistry and drug discovery, but on the experiences that shaped my instincts as a leader.
We are, in many ways, the accumulated result of what we’ve lived through.
In moments of uncertainty, you don’t default to frameworks or slides. You default to who you are.
Where It Started
I was born into a family that didn’t have the luxury of assuming things would simply work out. My parents came to the United States as South Asian immigrants, part of a generation made possible by the courage of those who led the Civil Rights Movement and the immigration reforms of the 1960s that opened doors for families like ours.
But opportunity wasn’t guaranteed. It had to be earned and then re-earned.
My father embodied that reality. Trained as an engineer, he drove taxis, delivered pizza, and did whatever it took to get through graduate school. He built a remarkable career as a petroleum engineer across the globe before eventually becoming an entrepreneur, starting businesses, losing them, and building again. None of it would have been possible without my mother, whose willingness to move across the world at a moment’s notice gave my siblings and me the foundation of adaptability we still carry today.
He supported not only our immediate family, but a large extended family across the globe who depended on him. What stood out most wasn’t just how hard he worked, but how selflessly he gave. There was no expectation of return, no calculation.
Helping others was simply part of what it meant to move forward.
Looking back, the foundations of my leadership were established. It became clear that responsibility is rarely convenient, adaptability is rarely optional, and helping others is not separate from progress; it is often the reason progress happens at all.
Growing Up Between Worlds
My siblings and I were born into motion before stability ever really existed. We were each born in different countries, with family spread across Pakistan, India, England, and the United States. My father’s work kept us moving, so I grew up seeing the world as interconnected long before that idea became mainstream. Opportunity never felt tied to one place. It felt tied to effort, adaptability, and the willingness to start again.
At the same time, living in Saudi exposed me early to the limits of that opportunity. Religious freedom was constrained, social hierarchies were rigid, and racism wasn’t abstract, it was experienced. Moving to Houston in 1990 felt like a different kind of possibility, but even that came with its own lessons. The Gulf War was unfolding, and a decade later, 9/11 would quickly make identity something others defined before I had the chance to define it myself.
I experienced how easily a person could be judged by their name, their face, or a narrative told by someone else.
Every generation is shaped by its defining tensions, and mine has been shaped by wars in the Middle East, rapid technological change, constant connectivity, and the beauty and wonder of watching humanity continue to push outward, all in parallel. We grew up watching the world become smaller, faster, and more connected, to the point where life without that constant connectivity now feels almost unimaginable. We learned to hold optimism and instability at the same time.
But between caution and optimism, I learned that systems are far more fragile than they appear to be. Things don’t work simply because they are supposed to; they work because someone takes responsibility for making them work. That belief shaped how I continue learning to lead:
Look past labels, focus on substance, and remember that leadership is less about position and more about how you show up when things are unclear.
What I’ve Learned This Year
Leading Nimbus has been less about discovering new ideas and more about seeing familiar truths with greater consequence. Like most of my colleagues, I often default to carrying more than I should, quickly stepping in when things feel uncertain and equating responsibility with doing rather than enabling.
And I’ve had to work on that.
Because at this stage, leadership isn’t about how much you personally accomplish. I It’s about what continues to work without you. It’s about building systems, teams, and cultures that are resilient and capable on their own.
Finally, stepping into the role was less about ambition and more about responsibility. Titles matter far less than the obligation that comes with them, to the patients waiting for better medicines, to the people who trust you to lead, and to the team building alongside you every day.
Why Medicines Matter
Somewhere along the way, the instinct to take responsibility when something matters connected with something more specific: medicines matter.
Through my family, my experiences across different parts of the world, and the perspective that comes from seeing both uncertainty and resilience up close, I came to believe that helping patients is one of the few things that remains undeniably clear.
In a world that often feels divided and uncertain, disease doesn’t discriminate. Relief is tangible. Impact is measurable in a way that cuts through everything else.
But that clarity does not exist in isolation. It is built, day by day, through people. At Nimbus, helping patients starts with how we show up for one another. The same instinct to take responsibility extends inward: we support, challenge, and care for each other so that the work itself can be stronger.
A culture of helping is not an abstraction. It is a practice. It shapes how decisions get made, how setbacks are navigated, and how trust is built across teams.
Purpose has a way of simplifying decisions. Patients do not need narratives. They need medicines that work. And creating those medicines depends on people who feel supported, accountable, and connected to something larger than themselves.
How This Shows Up at Nimbus
The way we are building Nimbus is not separate from how I’ve learned to lead. It is a direct reflection of it. We are fortunate to have access to powerful tools from computational chemistry to structural biology to our expanding role of AI in discovery. These tools allow us to explore chemical space and generate insight at a scale that wasn’t possible even a decade ago.
But we’ve been deliberate about how we use them.
We do not see AI or computation as answers in themselves, but as tools to accelerate learning, surface risk earlier, and improve decision-making. The real bottleneck in drug discovery isn’t data or technology, it’s judgment. Some of our most important decisions have been to stop programs that weren’t working, not because failure is the goal, but because discipline is. Creating value often means killing the wrong programs earlier, so we can focus our time, capital, and energy where we have the greatest chance to make medicines that matter. The advantage isn’t better tools alone, but the ability to ask better questions, learn faster, and make better decisions sooner.
What Leadership Means to Me Now
Over time, my view of leadership has become simpler. It is less about having all the answers and more about being willing to take responsibility when answers aren’t obvious. It is about focusing on what actually works, not on what sounds good. It is about surrounding yourself with people who are better than you in specific ways and trusting them to deliver.
And it is about remembering who the work is for.
At the end of the day, the decisions we make are not abstract. They affect real people. Patients. Families. Individuals waiting for something better. That perspective has a way of grounding everything else.
I grew up in a world that taught me two things at the same time: systems can fail, and progress is still possible.
That combination has stayed with me. It shapes my relationship with responsibility, my approach to leadership, and how we build at Nimbus. Because in the end, leadership is not about building something impressive. It is about building something that matters.
And maybe that is the simplest question any of us should keep asking: Are we building something that truly matters to the patients who need it most?
Many thanks to Dr. Priya Nalkur, Ed.D., President of The Roundtable Institute, for her thoughtful feedback, years of coaching, and for continually helping me reflect more deeply on leadership, purpose, and the responsibility that comes with both.
