Rolf Michael Range

Rolf Michael Range, internationally respected mathematician, devoted husband, father, grandfather, and global citizen, passed away peacefully on June 20, 2025, at the University of Utah Hospital in Salt Lake City. He was 80. 

Michael’s life was a profound blend of intellectual achievement, cultural depth, and personal devotion. His influence stretched from lecture halls and research institutes around the world to dinner tables filled with laughter, ideas, and love. 

Born in Neuglobsow, Germany during the final year of World War II, Michael spent his early childhood in Berlin before relocating with his family to Milano, Italy. His identity—shaped by postwar Europe—was rooted in resilience, humanism, and curiosity. Though German by birth, he often said he felt more Italian, and proudly embraced the term “European.” 

He studied mathematics at the University of Göttingen, where the lectures of Hans Grauert inspired him to pursue research in multidimensional complex analysis. A Fulbright Fellowship brought him to the United States in 1968, and he earned his Ph.D. from the University of California, Los Angeles in 1971. Over the next four decades, Michael held academic positions at Yale University, the University of Washington, and the State University of New York at Albany. He also served as a visiting scholar at the Max Planck Institute in Bonn, Germany, the Mittag-Leffler Institute in Stockholm, Sweden and research institutes in Barcelona, Spain and Berkeley, California. He has lectured in many countries, including mini-courses at the Chinese Academy of Sciences in Beijing, POSTECH in South Korea, the University of Trondheim, Norway, and the University of Ghana at Legon.

Michael’s research focused on extending the beauty and power of classical complex analysis into higher dimensions. He made major contributions to integral representations, the Cauchy-Riemann equations, and the geometry of complex spaces. His widely cited textbook, Holomorphic Functions and Integral Representations in Several Complex Variables (Springer, 1986; 1998), remains a foundational resource in the field. In 2004, he was honored with the Lester R. Ford Award from the Mathematical Association of America for his article “A Brief Tour into Higher Dimensions”, recognizing his gift for making complex ideas accessible and elegant. 

Later in life, Michael turned his attention to mathematics education and pedagogy. Deeply concerned about how calculus was being taught to increasingly diverse student populations, he wrote What is Calculus? From Simple Algebra to Deep Analysis (2015), reimagining the subject from first principles. His final book, Calculus: A New Approach for Schools that Starts with Simple Algebra, reflects decades of thinking and will be released posthumously in August 2025 —a fitting capstone to a career defined by clarity, rigor, and generosity of thought. 

Michael’s personal life was filled with love, purpose, and service. In the pursuit of other means to lift himself off the ground, he even acquired a pilot’s license for a spell of time—and once tried skydiving—one of many ways he embraced life with curiosity and a spirit of adventure. He shared more than 50 years of marriage with Alexandria (Sandrina) Villegas Range, a dedicated mother, advocate for education, and beloved partner in family, travel, and community. They lived near Albany, New York for many years, where they raised their three children—Ofelia, Marisa, and Roberto. In 2015, Michael and Sandrina became residents of Park City , Utah where they co-founded a scholarship fund for first-generation Hispanic students. They traveled extensively around the world and were delighted to spend their retirement years in Utah, making new friends, enjoying hiking, biking, and skiing, and appreciating all the gorgeous mountain wildflowers. After Sandrina’s passing in 2020, he honored her memory through ongoing philanthropic support to the Huntsman Cancer Institute, in gratitude for the care she received. Her absence left a lasting imprint on his life, honoring the love and history they shared over five decades. 

In 2022, Michael married Adjoa Amana, a friend of the family for over 40 years. She is a retired United Nations public health and development expert. They married in Santorini, Greece, celebrating with family and friends from multiple continents. Michael and Adjoa’s relationship was grounded in mutual love, admiration, and respect. They shared commitments to global justice, education, and creative empowerment. Together, they traveled extensively, including several trips to Africa, Europe, the Middle East, and the Caribbean. They enjoyed symphonies, movies, vibrant conversations on global issues, good food, and the joy of shared adventures. Michael sponsored a successful educational initiative in rural Ghana offering low-income primary school children a better chance to continue to secondary school and beyond.

Michael was a devoted husband, father and grandfather. He instilled strong values and an appreciation for global cultures in his children. He found deep joy in the lives of his grandchildren, whose curiosity and education he always encouraged. He especially treasured outdoor adventures with his family and taking trips to Europe and Mexico. He loved engaging in lively discussions about current events and sharing great dinners laced with spirited storytelling (and the occasional math lecture). Michael delighted in watching his family grow and in seeing his values take root in a new generation. 

He was preceded in death by his parents, Kurt and Dorothea (Ilse) Range, and his first wife, Alexandria (Sandrina) Villegas Range. He is survived by his wife Adjoa, his children—Ofelia (Adonis El Fakih), Marisa (Glenn Goldenberg), and Roberto (Marion Stemmer); his step children—Bidiak (Kara Amana) and Arit; his grandchildren—Kareem and Kayan El Fakih, Josh Goldenberg, and Alex Range; his step grandson, Kweku; and his brother Rainer (Karin Range). Michael will also be missed by an international circle of extended family, friends, and colleagues. 

Michael’s legacy is both academic and deeply human. His life reminds us that ideas can be elegant, that love can span cultures, and that truth and kindness are not mutually exclusive. He will be remembered always—for his brilliance, his integrity, his honesty, and his kind heart. 

A private celebration of his life will be held in Park City this summer. If you would like to honor Michael’s memory, the family would be grateful to your contribution to the scholarship program he established, The Michael and Sandrina Villegas Range First Generation Hispanic Scholarship Program, c/o Park City Education Foundation, P.O. Box 681422, Park City, Utah 84068, or to the Huntsman Cancer Foundation, 500 Huntsman Way, Salt Lake City, Utah 84108.