Dan Amos has served as chief executive of Aflac since 1990, making him the longest-tenured CEO among Fortune 250 companies following Warren Buffett’s retirement. Under his leadership, the health insurance firm, valued at $58 billion, has transformed its focus on supplemental health insurance into a widely recognized brand, in large part through a distinctive marketing strategy involving a quacking duck mascot introduced in 2000.

Despite the national average CEO tenure shrinking to 5.3 years, Amos has maintained a steady and consistent approach, emphasizing predictability and clear communication with his team. Early in his tenure, he made the strategic decision to exit five international markets and concentrate Aflac’s efforts primarily in the United States and Japan. Today, the company generates more than half of its $17 billion in annual revenue from Japan, where it insures approximately one in four households and holds 76 percent of its global assets.

Aflac’s success in Japan traces back to Amos’s uncle John, a former CEO who identified the potential of the Japanese market after observing local health-conscious behaviors in the 1970s. The company became the first Western insurer allowed to sell supplemental cancer policies in Japan following a prolonged regulatory approval process. Amos attributes part of the company’s ability to bridge cultural differences to its Southern U.S. roots, noting a shared methodical approach between Southern Americans and Japanese business culture.

Managing operations across the U.S. and Japan involves challenges that Amos addresses by setting broad guidelines while empowering local leadership to operate within their cultural context. This decentralized approach allowed the Japanese division to pursue unique marketing initiatives, such as sponsoring theatrical productions, which Amos initially questioned but ultimately supported after seeing their success.

The company’s marketing breakthrough in the U.S. came with the introduction of the Aflac duck advertising campaign, designed to increase brand recognition, which had hovered below 10 percent despite a decade-long national marketing effort. Amos took a calculated risk to promote the duck, which first aired on CNN at the turn of the millennium, coinciding with global concerns over the Y2K bug. The campaign significantly boosted brand awareness to over 80 percent and doubled U.S. sales within three years.

However, deploying the duck campaign in Japan required adaptation due to cultural and linguistic differences. Initial efforts were poorly received, but after several revisions, the duck character became a beloved symbol in both markets. Today, Aflac distributes millions of branded stuffed ducks annually as part of its charitable and promotional activities.

Looking ahead, Aflac faces challenges as the U.S. insurance market evolves, particularly with 98 percent of policies sold through employer-sponsored programs and the growth of the gig economy threatening this model. Analysts suggest that shifting toward direct-to-consumer sales could be essential for the company’s future growth, leveraging the strong brand identity established by the duck mascot.

Throughout his tenure, Amos has maintained a cautious financial strategy, avoiding riskier investments like private credit and instead focusing on bonds to safeguard liquidity. The company also added a reinsurance arm to efficiently deploy capital from its Japanese operations into higher-yielding U.S. bonds.

As Amos reflects on his role, he emphasizes accountability to shareholders and adherence to commitments, highlighting Aflac’s pioneering move to allow shareholder votes on executive compensation starting in 2008. He advises new professionals to stay focused on their goals and maintain resilience amid challenges, a philosophy that has guided his steady leadership for more than three decades.