Thank you, Abby. Good morning, everyone, and thank you for joining us today. We are very pleased to report, first quarter core income $699 million or $2.73 per diluted share, both up from the prior year quarter. Despite our highest ever level of first quarter catastrophe losses. A higher level of core income for the quarter was driven by very strong underlying underwriting income, as well as higher levels of favorable prior year reserve development and net investment income. All of which more than offset the record level of catastrophe losses. Underlying underwriting income of $735 million pre-tax was nearly 25% higher than in the prior year quarter, driven by an increase in net earned premiums to $7.4 billion and an underlying combined ratio which improved almost two points to an excellent at 89.5%. We are particularly pleased with the strong underlying fundamentals in all the three of our business segments. In Business Insurance, the underlying combined ratio improved by more than three points, which again included the benefit of earned pricing that exceeded loss cost trend. On Specialty Insurance and Personal Insurance, both benefited from higher earned premiums and continued strong margins. Turning to investments, our high quality investment portfolio continue to perform well, generating net investment income of $590 million after-tax for the quarter, up 14% from the prior year quarter. These results together with our strong balance sheet enabled us to grow adjusted book value per share by 9% over the past year, after making important investments in our business and returning excess capital to shareholders. During the quarter we returned $613 million of excess capital to shareholders, including $397 million of share repurchases. In recognition of our strong financial position, confidence in our business. I'm pleased to share that our Board of Directors declared a 4% increase in our quarterly cash dividend to $0.88 per share, marking 17th consecutive years of dividend increases, with the compound annual growth rate of 9% over that period. Our Board also authorized an additional $5 billion of share repurchases. Turning to production, we remain pleased with the execution of our marketplace strategies. During the quarter we grew net written premiums by 2% to $7.5 billion. Our premium growth once again reflects strong renewal premium change and retention in each of our three segments. In Business Insurance, renewal premium change increased to 9.2%. Its highest level since 2013 and four points higher than the prior year quarter. While retention remains strong. Workers compensation, pure renewal rate change was slightly negative, but continued on an improving trend. Workers comp renewal premium change, which includes exposure was positive for the first time in a number of quarters. Both renewal rate change, annual premium change in every other product line, were near or above recent record highs. Net written premiums in business insurance were down a little bit year-over-year, driven overwhelmingly by the workers comp product line, primarily reflecting the impact of the pandemic on payrolls. As we're comparing a pandemic impacted quarter in the current year, to a largely pre pandemic quarter in the prior year. Bond & Specialty Insurance net written premiums increased by 9%. Driven by renewal premium change of nearly 11% in our management liability business, while retention remained strong. Across our commercial businesses, the pricing environment continues to be rational and favorable, with written pricing well above estimated loss cost trends. Overall pricing levels continue to be near record levels and while margins have improved, given the continued headwinds impacting returns for the industry. We expect pricing to continue to outpace loss trend for some time. Turning to Personal Insurance, production was excellent in the quarter. Net written premiums increased by nearly 7%, driven by renewal premium change of almost 8% in our homeowners business, strong retention in new business in both auto and home. New business for both auto and home combined was up 17% compared to the prior year quarter, which is the ninth consecutive quarter of double digit growth in new business, demonstrating the ongoing success of our product, distribution and customer initiatives. Before I turn the call over to Dan, given the elevated frequency and severity of catastrophes in recent years, including the recent severe winter weather, I'd like to take a minute and highlight the work we've done in terms of the strategic management of our catastrophe exposure. Some number of years ago when consistent with our approach generally of recognizing, assessing and addressing trends rapidly, we took decisive action in anticipation of continued whether volatility. Our efforts started with talent. We got an experts in data science, meteorology, geophysics, and environmental engineering, among others, for our Cat Management organization. We also established dedicated teams for each catastrophe peril, with the goal of developing industry leading scientific and underwriting expertise. We have incorporated the results into our product development, risk selection, pricing, capital allocation and claim response. The insights we have developed have enabled us to supplement standard vendor cat models, with our own sophisticated peril-by-peril view. This gives us a refined granular view of cat risk, incorporating proprietary variables such as complex route characteristics, tree and brush density, and location intelligence down to the parcel level. These variables are incorporated into our product developed enhancing segmentation. They're also integrated into proprietary algorithms that we use at the point of sale, to inform risk selection and decisions about terms and conditions. Those of our claim response, our data scientists and other experts have developed geospatial tools, artificial intelligence and analytic models to facilitate a more effective tailored deployment claim resources. This has resulted in a more satisfying experience for our customers and a more efficient outcome for us. Taken together these efforts have enabled us to more effectively manage our exposure to catastrophes. While there's always the potential for us to have outsized exposure to an event. Over the past five years, our share of property catastrophe losses relative to total property catastrophe losses for the domestic P&C industry has declined significantly, compared to the five years prior to that. Our property cat losses over the past five years have also been meaningfully lower than our corresponding market share. Advancing our understanding of the risk and reward of catastrophe underwriting is an ongoing effort for us. As a footnote, but importantly, we've made these and other strategic investments in our business while we improved our expense ratio. So to sum up, the strength of our underwriting and investment expertise enabled us to deliver strong profitability in this quarter, notwithstanding the severe winter weather. As a result, we're off to a terrific start for the year. We're particularly pleased with the strong underlying fundamentals in all three of our business segments. Our proven strategy, strong track record of execution, leading analytics, talent advantage, give us confidence that we are well positioned to capitalize on opportunities as the economy recovers. And with that, I'm pleased to turn the call over to Dan.