Muller Search has played a transformative role in my career. My advancement into senior finance roles—including Chief Financial Officer and Treasurer positions at some of the world’s largest Globally Systemically Important Financial Institutions—was enabled not only by opportunities introduced to me by Sonja Muller, but more crucially by the insight, perspective, and counsel she has consistently provided.
Sonja Muller, the founder and principal of Muller Search, brings far more than access to roles. She brings judgment. Her understanding of organizational dynamics, leadership fit, and cultural nuance is extraordinary. She has a rare ability to frame a potential move not merely as a new job, but as a strategic career decision—considering timing, stakeholders, long-term goals, and personal values. With her help, I’ve made bold decisions to leave roles where I was thriving and highly valued. These choices were not easy—but they were the right ones. In each case, Sonja’s guidance helped me take the leap with clarity and conviction. I have never regretted it.
Equally remarkable is the caliber of candidates she identifies for senior roles when working with her as a hiring firm. Her search approach is more imaginative and expansive than that of her peers. She casts a wider net and has a unique ability to relate the skills required for a role to experiences not immediately obvious at first glance. More importantly, she has a rare instinct for spotting individuals earlier in their careers who are genuinely capable of stepping into much bigger roles. Time and again, I’ve taken chances on Sonja’s recommendations—and been richly rewarded by the results. These hires have materially strengthened my teams: they’ve elevated technical quality, brought fresh energy, and measurably improved delivery and productivity.
What makes Muller Search truly exceptional, however, is their ability to close the search. Whether as a candidate or a hiring manager, I’ve seen firsthand the care they show for individuals, the depth of their client relationships, and their ability to align both sides of the table. This results in the right decisions, the right framing, and—importantly—the establishment of real trust and connection between the hiring manager and the candidate.
Muller Search’s discretion, professionalism, and integrity are impeccable. Over the many years I’ve known Muller Search—and Sonja specifically—I have come to trust her judgment completely. She is not only a search professional of the highest caliber, but also a valued advisor, a career strategist, and a trusted sounding board. For anyone navigating the highest levels of financial leadership—or seeking to build exceptional teams—I cannot recommend her, and Muller Search, highly enough.
