 Varney is one of only fourth outsider recruited to be named a partner at the firm in 50 years.There, Varney has advised clients on mergers across various industries, including acquisitions of Time Warner by ATT, Virgin Atlantic by Delta, Talenti by Unilever, Pinnacle by Conagra, and Heinz by Kraft

She joined the faculty of Columbia Law School as a lecturer in Law in 2017, and teaches the course Antitrust in Action, alongside Cravath partner and author David Marriot.Varney is recognized by the "National Law Journal" as one of the “100 Most Influential Lawyers in America”, and as among the 50 “Governance, Risk & Compliance Trailblazers & Pioneers”.