Thank you, Catherine, and good morning, everyone. Welcome to our fourth quarter and full year 2020 conference call. I'm joined virtually by Christa Davies, our CFO; and Eric Andersen, our President. As in previous quarters, we posted a detailed financial presentation on our website. There are very few firms who can say they end in 2020 stronger than they began. And I want to thank our colleagues for making Aon one of those firms. Our team delivered a tremendous year set against the public health and economic impact of COVID-19 and an overall unprecedented level of global volatility punctuated by social unrest around the world. During the year, our colleagues came together to deliver results for clients, devote time and energy to getting to know the Willis Towers Watson team and the integration planning for our pending combination and to support each other through personal and professional challenges. One silver lining that we heard over and over from colleagues was the 2020 was a year of increased connection across our firm. We saw our colleagues respond to the virtual environment for replacing in person connections with introducing experts and sharing thought leadership with clients. We felt the impact of that connectivity as our COVID-19 taskforce ramped up to share insights and best practices. And we saw it translate into client success as local teams won new business by seamlessly bringing together colleagues from across the globe. By all accounts 2020 tested our firm. Looking back, it's clear that our colleagues not only passed, but this adversity actually accelerated our one firm strategy. Seeing our colleagues come together and forge stronger connections in new ways was inspirational. And we'll build on these positive learnings and practices in 2020 as we continue to reject the constraints of the so called new normal, and instead look forward to defining a new better on our terms as we begin 2021. Turning into financial performance in the fourth quarter, we delivered a great finish to the year with 2% organic revenue growth across the firm, including 12% growth in reinsurance solutions and 4% growth in commercial risk resolutions. As in recent quarters, organic revenue growth in the fourth quarter was driven by strength in the core areas of our business, reflecting the resilience of our firm in a challenging economic environment, overcoming ongoing unexpected pressure in the more discretionary areas. In particular, we would highlight growth in the core, driven by ongoing strong retention and net new business generation. As we continue to deliver innovative solutions to our clients in a challenging environment. We saw increased organic revenue growth as compared to the third quarter despite that somewhat larger portion of more discretionary revenues in the fourth quarter. The strong results stem partially from improvements in economic factors, and sentiment around the virus and vaccine, which drives client buying behavior and investment. For example, we saw positive impacts to our revenue from construction starts and M&A activity in the US, as well as from employment levels. I would also note that in more discretionary areas, we're seeing meaningful variation in revenue growth across our businesses, with some recovering more quickly and some more slowly, largely driven by external factors tied to economic reopening, and recovery. For example, I would highlight strength and voluntary benefits in Health Solutions, and construction and commercial risk. I would also note that more discretionary areas like travel and events within data analytics and even capital within retirement solutions continue to be impacted by economic and pandemic related conditions. Our strong finish in Q4 contributed to full year financial results that demonstrate the strength and resilience of our business in this uncertain economic environment. For the year, we delivered organic revenue growth of 1%, operating income growth of 4% with full year operating margins of 28.5%, an increase of 100 basis points from 2019 and free cash flow growth of 64% to $2.6 billion, the highest free cash flow in the history of our firm. This outstanding progress against each of our key financial metrics is a direct result of our one firm strategy, which guides everything we do in supporting colleagues, delivering value to clients and driving shareholder value. We are well positioned to continue to build on this momentum. And while we see many positive signs for the economy, significant uncertainty remains and we expect the recovery will remain inconsistent. We continue to monitor several key factors including GDP, asset values, corporate revenues and employment. As we looked at 2021 with significant uncertainty remains, we expect as economic conditions continue to stabilize and improve; we anticipate modest growth in Q1, with growth increasing toward mid-single digits as we continue through the year. Looking back, the challenges we faced in 2020 underscore the importance of our colleagues, our culture, and our commitment to inclusion and diversity. We've long observed that leaders who embody one firm are most successful leaders, both in delivering business results and driving colleague engagement. And this year, we've seen that in such a leadership trait results even stronger engagement and competence in the combination, as measured in a January poll survey reflecting high engagement, we consistently lower voluntary attrition, which decreased by 35%, year-over-year from 2020 with strength in every major region and solution line. Further, we know that diverse talent, expertise and insights of our colleagues are vital to the success of our firm and our clients. And we continue to invest to attract growth and retain the best talent. We supported this priority; we announced the expansion of our apprenticeship program, including an investment of $30 million over the next five years, and development of a nationwide network of employers to create 10,000 apprenticeships by 2030. With this expansion we're building on our already successful program, which bridges the gap from education to employment for bringing high school graduates into the workforce while they complete their college education. This program provides a fantastic pipeline of diverse talent and embodies our commitment to inclusion and diversity. In addition to emphasizing the importance of our colleagues and our culture, the events of 2020 expose the interconnected nature of risks and vulnerabilities in many companies. Our recently published 2020 risk report highlights the increasing likelihood of connected extremes and reinforces that leading organizations of the future will be defined by their ability to manage the global implications of long tail risks. In the survey of over 500 organizations, across geographies and industries 82% did not had pandemic in their Top 10 risks before COVID-19 struck, and only 30% had a pandemic plan in place. Looking forward, respondents overwhelmingly agreed on the need for an enterprise wide approach to risk. We know that existing emerging long tail risks will continue to challenge organizations across all industries and geographies. Organizations must prioritize strategies to address risk and resilience. We also know our strategy enabled us to support clients in this changing landscape because it enabled us to understand their biggest challenges and bring world class content capability and innovative solutions to bear. And while we didn't architect or pending combination with Willis Towers Watson with the pandemic in mind, we see that the pandemic and its associated economic impacts had increased our conviction and the need to accelerate innovation to address client demand. On the topic of Willis Towers Watson, our excitement about the combination as well as the leadership and talent from both sides continues to grow. Last week, we reached another important milestone with the announcement of the combined executive committee that will be in place once the combination is closed. This team embraces the commitment to a one firm mindset and brings together the best expertise, talent and leadership from both organizations. This team also brings to the table an exceptional set of experiences and capability, reinforcing the power of inclusion. As we said before, our culture is built to bring the best of our firm to clients. It's an essential part of how we operate our firm and drive results. At Willis Towers Watson, it's clear that their culture is equally focused on putting clients first; this newly announced team will blend the best of those cultures. And that client focus mindset will guide everything we do. In summary, 2020 was a momentous year. Our performance and actions throughout the year reflect exceptional resilience. Now the results of structural steps and investments we've made to ensure we're ready to not only take on but grow stronger in the face of these challenges. Further, we've demonstrated momentum that will accelerate in combination with Willis Towers Watson. We begin 2021 in a position of strength to continue executing our strategy and making progress on our key financial metrics, both the standalone Aon and in our pending combination with Willis Towers Watson creating a significant growth opportunity for clients, for colleagues and for shareholders. Now, I'd like to turn the call over to Christa for her thoughts on our financial progress this year, and long-term outlook. Christa?