Great. Thank you very much, Darryl. And good morning, and welcome to our fiscal year 2023 first quarter's earnings conference call. We had an excellent first quarter and start to our 2023 fiscal year, setting new records for net revenue, our operating income and earnings per share. In the quarter, our EBITDA margin exceeded 14% for the first time in our history. Backlog, the best indicator of future growth for us, achieved an all-time high of $3.81 billion, up 11% from last year. And just as the first quarter closed, we announced the acquisition of Amyx, bringing 500 high-end security cleared staff to our US federal IT practice. And more recent, back just 10 days ago, we completed our acquisition of the RPS Group that adds 5,000 staff and provides new growth opportunities, especially in international water and energy consulting business. I'll begin today's presentation with an overview of our first quarter results and the business outlook, while Steve Burdick, our Chief Financial Officer, will provide additional details of our financial performance and capital allocation. Jill Hudkins, our President will also provide additional insight into our strategic growth opportunities that we see together with RPS. We had a very strong first quarter, setting new records for net revenue, operating income, adjusted earnings per share and backlog. Our net revenue was $737 million in the quarter, up 8% from the prior year, a new all-time high for any quarter in the company's history. We also had a record 14% adjusted EBITDA margin, which is 90 basis points increase from the prior year. As a result of this increased margin, we generated an operating income of $97 million for the company, up 17% year-over-year. Earnings per share from operations were a record $1.34 for the quarter. First time we've ever ceded $1.30, up 20% from last year on an equivalent tax basis. And in fact, we were well over $2 on a GAAP basis of earnings per share in the quarter. I'd now like to provide an overview of our performance by our end customer. In the first quarter, our growth was driven by strong performance across all four of our key client sectors. Our US Commercial net revenue was the fastest-growing sector in the company with net revenue up 22% year-over-year and comprised about a quarter of our overall business. The commercial growth was driven by strong performance in high-performance buildings, environmental restoration and a very fast-growing area in renewable energy services. Work for our US Federal clients was up 10% year-over-year and represented 28% of our net revenue in the quarter. The increase in our US Federal work was driven by a very broad-based increases across all of our key government clients, but it was especially driven by civilian agencies for the US Federal government such as the Environmental Protection Agency, US State Department and the US Agency for International Development. Our state and local revenues for municipal, water, infrastructure and planning services grew at a 10% rate year-over-year this quarter with continued strong demand for our best-in-class water supply and watershed management solutions. This 10% growth builds on our seven consecutive years of double-digit growth in the state and local markets here in the United States. Our International net revenue was up 13% year-on-year on a constant currency basis, driven by growth in water, environmental and sustainable infrastructure work, primarily in the countries of Canada, Australia and the United Kingdom. I'd now like to present our performance by our two segments. Our GSG and our CIG segments, both grew in the first quarter as a result of broad-based demand for our high-end services. I'll start with the GSG segment or the Government Services Group segment, which was up 8% and year-over-year with the growth in water and environmental programs. Our GSG segment delivered a record 17.1% margin, up 240 basis points from last year. This record margin was a result of really three different things. First, continued business shift in our mix to higher-margin services. Second, favorable project close-outs and really project performance. And third, higher utilization in the quarter. We had especially strong utilization for US Federal work and our disaster recovery services for responding to Hurricane Ian, which impacted Florida really just coming into the quarter during the month of October and extending through November and December. Without the extraordinary margin contributions from these project close-outs and episodic disaster work, we really would have seen about a 15% margin in the GSG segment for the quarter and it's probably more representative of an ongoing margin for that particular segment. The CIG segment grew by 9% year-on-year and delivered a 13.1% margin in the quarter, up 60 basis points from last year in line with our expectations. This is the fifth consecutive quarter with a year-on-year margin expansions for the CIG segment. The margin expansion in the first quarter was driven by strong utilization in high-performance buildings, environmental programs and renewable energy services across our global operations. Backlog at the end of the quarter was up 11% year-on-year, resulting in an all-time high ending value of $3.81 billion for the company. In the first quarter, we won many new programs and task orders with both our commercial and government clients here in the United States and internationally. We leveraged our $25 billion value in contract capacity with the US federal government, and our existing master service agreements, to generate almost $1 billion in new orders just in the quarter. We were also awarded new programs such as the $42 million in additional contract capacity by USA for Energy Transformation Services in Moldova, and a new $95 million contract with the United States Navy to support their environmental restoration needs. This broad-based backlog provides us with excellent visibility, through the remainder of fiscal year 2023. Now, just 10 days ago on January 23, we closed the acquisition of the RPS Group, and we're rapidly moving forward on shared opportunities, collaboration, and actually aligning their systems with ours. And I'm very pleased to welcome everyone at the RPS Group to Tetra Tech. The RPS Group brings to Tetra Tech over 5,000 staff that are highly aligned with our approach to projects and high-end consulting services in key geographic regions that we've been targeting for future growth for some time. RPS doubles our staff in the United Kingdom and Australia broadening our services and client relationships in both of these regions. RPS also extends our operations by adding 1,200 employees in Europe, across the countries of Norway, Netherlands and the Republic of Ireland giving us for the first time, a significant presence in that region. When we actually combine Tetra Tech and the RPS Group, we now have an organization collectively with 27,000 employees, working from 550 offices worldwide, servicing 22,000 clients and we collectively deliver 100,000 projects a year with an annualized revenue of approximately $4.5 billion. Together, Tetra Tech and RPS, this team is leading the science and driving growth by addressing our clients increasing needs for water, environment and sustainable infrastructure services. At this point, I'd like to turn the presentation over to our Chief Financial Officer, Steve Burdick, to go through more details of our financial performance in the quarter. Steve?