Particle research can encompass both the grand and the minute — there exists an entire universe of airborne particles to pursue and observe, a focus that has occupied much of Joshin Kumar’s doctoral studies at the McKelvey School of Engineering at Washington University in St. Louis. His focus turned upwards, investigating the particles that contribute to climate change and air pollution. However, his PhD mentor, Rajan Chakrabarty, a professor specializing in energy, environmental, and chemical engineering, drew him into a significantly narrower domain: identifying the airborne particles that lead to illness.
This endeavor culminated in groundbreaking science, a unique biosensor capable of identifying airborne avian flu particles and possibly much more.
Kumar is continuing his journey at WashU, engaging in postdoctoral research within the Chakrabarty lab, aiming to enhance this sensor technology to make it easily accessible for industries and individuals eager to swiftly monitor airborne pathogens and various microbes.
How has your leadership perspective been influenced while at WashU?
My leadership perspective at WashU was significantly influenced by Dr. Chakrabarty. He taught me that authentic leadership — particularly in academia — is not about issuing commands or overseeing every detail. It’s about equipping individuals with the right tools, offering guidance, and fostering trust so they can excel.
When I faced challenges with the biosensor, the team in Dr. Chakrabarty’s lab, including Dr. Meng (Max) Xu, truly assisted me in identifying the issues. We enhanced it incrementally. Observing Dr. Chakrabarty lead with patience and understanding made me realize that emotional intelligence (EQ) is equally as vital as technical expertise (IQ) in effective leadership. I have come to view leadership as creating a nurturing environment where everyone can succeed. WashU’s overall atmosphere — how it supports its community during challenging periods — embodies this philosophy as well. It’s a climate fostered by exceptional leaders, and I feel fortunate to have learned from it.
What has been your most significant learning experience during your time here?
I experienced a low phase during my PhD studies until I improved my self-care through the WashU Rec Center. Through engaging in gym workouts, swimming, and long-distance running, I discovered the importance of discipline, consistency, and commitment (especially discipline!). It began with challenging myself physically, but this resilience carried over into my PhD research and virtually every aspect of my life. I recognized that a healthy body and mind form the foundation for living life to the fullest, and I’m now quite passionate about it. I often encourage everyone — my friends, family, girlfriend, and even my PhD advisor — to stay active and prioritize their well-being. A healthy mind is rooted in a healthy body, and that’s a lesson I will hold onto forever.
What are your aspirations moving forward?
I’ve already embarked on my next phase as a postdoctoral research associate here at WashU. My PhD primarily focused on mastering the science — delving into atmospheric aerosols and their contribution to climate change. Now, in my postdoctoral position, I am transitioning to bioaerosols and biosensing while also acquiring essential skills: grant writing, mentoring students, and exploring new research trajectories. My PhD equipped me to conduct scientific inquiry; my postdoc is centered on learning how to lead such inquiries. Ultimately, I aspire for my human-focused research to impact climate change significantly and aid in preventing pandemics. That’s my grand vision!
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