Operator
Greetings, and welcome to ASGN Incorporated First Quarter 2021 Earnings Call. [Operator Instructions] As a reminder, this conference is being recorded.
It is now my pleasure to introduce your host, Kimberly Esterkin, Investor Relations. Thank you. You may begin.
Kimberly Esterkin --
Investor Relations
Thank you, operator. Good afternoon, and thank you for joining us today for ASGN's Second Quarter 2021 Conference Call. With me are Ted Hanson, President and Chief Executive Officer; Rand Blazer, President of Apex Systems; George Wilson, President of ECS; and Ed Pierce, Chief Financial Officer. Before we get started, I would like to remind everyone that our commentary contains forward-looking statements. Although we believe these statements are reasonable, they are subject to risks and uncertainties, and as such, our actual results could differ materially from those statements. Certain of these risks and uncertainties are described in today's press release and in our SEC filings. We do not assume any obligation to update statements made on this call. For your convenience, our prepared remarks and supplemental materials can be found in the Investor Relations section of our website at investors.asgn.com. Please also note that on this call, we will be referencing certain non-GAAP measures, such as adjusted EBITDA, adjusted net income and free cash flow. These non-GAAP measures are intended to supplement the comparable GAAP measures. Reconciliations between the GAAP and non-GAAP measures are included in today's press release.