Apple's Tim Cook is stepping down as CEO in September. Mario Anzuoni/Reuters Tim Cook is wrapping up a 15-year term as Apple CEO. As a leader, he's is known for asking hard questions and staying focused on the company's strengths. When he became CEO in 2011, Cook had to navigate the challenge of succeeding Apple's founder. Tim Cook took on a daunting job when he became Apple CEO in 2011 — and turned it into a 15-year run. He'll be leaving his CEO role behind and becoming Apple's executive chairman September 1. Cook will be succeeded as CEO by hardware boss John Ternus. Though Cook will stay in Apple's chief role for several months to help with the transition, observers are already reflecting on his legacy. Cook has been widely regarded as a steady leader who brought stability and scale to Apple in the post-Steve Jobs era. He's spent over a decade building a reputation around his measured management style and strong focus on supply chains and long-term growth. His longevity at the company is also notable. In the first half of 2025, the average tenure for outgoing CEOs was 6.8 years, according to Russell Reynolds data. Cook's time at Apple doubled that average. Here are five leadership lessons from Cook's time as Apple chief: 1. Ask the hard questions Cook may not be the loudest person in the room, but he has a reputation for putting his staff in the hot seat. In Cult of Mac editor Leander Kahney's 2019 book, "Tim Cook: The Genius Who Took Apple to the Next Level," the former CEO is said to be known for grilling employees to ensure they're on top of their responsibilities — and to make sure that Apple's supply chain was ready to meet intense demand. When Cook was chief operating officer, a position he held until being named CEO, Kahney wrote that the Apple CEO could "wear people down through an endless barrage of questions." Greg Joswiak, Apple's senior vice president of worldwide marketing, told Kahney that Cook is a "quiet leader" and "not a yeller," according to the book. However, he added that the CEO will "slice you up with questions. You better know your stuff." 2. Create your own version of success Cook had big shoes to fill when he took over from Jobs. While many CEOs have struggled to live up to iconic founders, Cook stands out as one of the few who managed to shine by leaning into what worked as COO. During his tenure, Apple has sold roughly 3 billion iPhones, and its market value has leaped from $300 billion to $4 trillion. Part of that success came from maintaining consistency in his own leadership style and strategy. He built on the momentum Jobs had established, scaling what was already working and largely entrusting product development to the company's famous hardware team. He also oversaw Apple's increased vertical integration. "Tim Cook's greatest accomplishments are the financial evolution of the company, the integration of Apple silicon, and maintaining the iPhone's dominant walled garden ecosystem," Morningstar analyst William Kerwin previously told Business Insider. Cook established his own distinct leadership style, rather than replicate Jobs' larger-than-life tech-genius persona. 3. Know your strengths Cook took advantage of Apple's expansive scale, launching wildly popular accessories and services, like its Apple Watch and AirPods, both of which helped the company keep customers within the Apple ecosystem. That ecosystem helped drive the steady growth of its services business, revamping the struggling MobileMe subscription into the popular iCloud storage service. Apple has lagged in the AI race, drawing concerns about whether it can keep up with competitors. However, its more measured spending could yet prove to be a prudent strategy, as its competitors shell out an eye-watering amount on AI investment. 4. Pick up the phone Tim Cook isn't expressly political, but he is diplomatic. In 2019, President Donald Trump said that Cook was the only tech leader to call him personally. Cook has continued to build his relationship with Trump over the past year, including announcing Apple's $600 billion investment in US manufacturing over the next four years. In reference to past conversations with Musk and President Trump, Cook said in a 2023 interview with GQ, "I feel very strongly about engaging with people regardless of whether they agree with you or not." "I actually think it's even more important to engage when there's disagreement," Cook told GQ. That strategy has paid off. Cook's discussions with Trump have managed to get some of Apple's products exempted from various tariffs. 5. Realize the value of your own experience Cook is notoriously private, but he has been vocal in certain instances. He was the first CEO of a Fortune 500 company to come out as gay in 2014 in a personal essay in Bloomberg Businessweek. He said he made the decision to come out because he thought it would make a difference to kids struggling to come to terms with their own sexuality. "Being gay has given me a deeper understanding of what it means to be in the minority and provided a window into the challenges that people in other minority groups deal with every day," wrote Cook. Cook has also criticized his home state, Alabama, for its failure to advance LGBTQ+ rights, and in a 2013 Wall Street Journal op-ed, he called on the US government to protect LGBTQ+ employees from discrimination. Read the original article on Business Insider