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A Career in Focus: Celebrating Yinru Sieracki

By Lynn McCain | May 14

Yinru Sieracki's first employee ID at U-M.After 35 years of dedicated service in the Department of Pathology, Yinru Sieracki, MD, MS is retiring, leaving behind a legacy of quiet excellence, deep curiosity, and unwavering commitment to patient care.

Yinru’s journey began in Shanghai, China, where she was born and raised. After completing her placement exams, she qualified to enroll in medical school, where she earned a medical degree from Shanghai University of Traditional Chinese Medicine and briefly worked as a physician. But like many who pursue new horizons, she was drawn by the promise of opportunity, the “American dream,” as she describes it, and made the courageous decision to move to the United States on her own, navigating not only a new country but also a new language.

In Michigan, Yinru studied English as a second language before earning a master’s degree in biology from Eastern Michigan University. It was there that she discovered electron microscopy, a field that would shape her entire career. After completing her studies, she joined the Department of Pathology, where she would remain for the next three and a half decades.

Yinru Sieracki working at the Electron Microscope.Yinru began her work as a histotechnologist in the Electron Microscopy (EM) Lab, eventually becoming a senior supervisor. Over the years, she mastered every aspect of the lab’s work, from tissue preparation and processing to capturing ultrastructural images that help pathologists make critical diagnoses. Her work has been especially impactful in renal pathology, where electron microscopy detects immune deposits, basement membrane changes, and podocyte injury. Renal pathology is the most common focus of EM studies, with findings including lupus and diabetes-related kidney conditions.

When Yinru first started, the work looked very different. Images were captured on black-and-white film. “When I first started, we didn’t have digital cameras. We had to develop the film and process everything. It took a long time for one case.” This time-intensive process required patience and precision in a lab located on the 2nd floor of Medical Science 1. Today, the lab operates in a fully digital environment at the North Campus Research Complex, allowing images to be captured and shared almost instantaneously, though they remain black-and-white. Moving the lab from MS1 to the NCRC was a major undertaking as the Electron Microscope is a very large, heavy instrument requiring special handling. With the move, the lab acquired a second EM and expanded its capacity to provide support for pathology diagnostics. Through all of this change, Yinru remained a constant: adapting, learning, and ensuring the highest standards of quality every step of the way.

Yinru's oil paintings.What kept her engaged for 35 years was not just the work itself, but the people and the continual opportunity to learn. “Medicine keeps changing, so there is always something new to learn,” she explained. She worked closely with generations of pathologists, who she credits as mentors, each contributing to her deep knowledge and skill, particularly the EM Director, Dr. Paul Killen (retired). She also remembers with appreciation the guidance of her former supervisor, Barbara Rogers, who played an important role in shaping her career.

Despite describing herself as shy, Yinru’s impact has been anything but quiet. Her physician’s training gave her a unique perspective. “Since I was trained as a physician, I always face each case as if it were a patient. I analyze every case that way. It is very interesting to me.” That sense of purpose has carried her through thousands of cases and helped support countless diagnoses.

As she steps into this next chapter, Yinru is excited to embrace new opportunities: traveling, enjoying the outdoors, and pursuing her passion for oil painting. After decades spent examining the intricate details of the microscopic world, she now looks forward to creating beauty on a much larger canvas.

Yinru’s career is a testament to perseverance, adaptability, and lifelong learning. Her work has touched countless lives with precision and care. As she retires, she leaves behind not only a body of work but a standard of excellence that will continue to inspire those who follow.

We wish Yinru all the best in her well-earned retirement.

 
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