"…an amazing attorney who has helped create the standards for how customers purchase technology."
Chambers Global


Dan Masur is senior counsel in Mayer Brown's Technology Transactions practice.

For more than 20 years, Dan has represented national and international clients in a broad range of on-shore, near-shore, and offshore information technology and business process sourcing transactions involving global and niche outsourcing providers, offshore captives and various hybrid structures. In addition, in recent years, Dan has represented clients in cutting-edge arrangements with digital service providers involving cloud, “big data,” “as-a-service,” “internet of things,” robotic process automation, artificial intelligence and blockchain. Dan also deals on a regular basis with data privacy, data protection and cybersecurity issues.

Dan has represented established and emerging companies in many different industries, including banking, aerospace, defense contracting, electronic commerce, financial services, pharmaceuticals, insurance, health care, life sciences, chemicals, consumer products, manufacturing, oil/gas, real estate, forestry products, telecommunications, information technology, and utilities/electrical power.

Dan is recognized as one of the leading lawyers in the highly specialized outsourcing field by Chambers Global (“1” ranking in “Outsourcing”), Chambers USA (“1” ranking in “Nationwide: Technology” and “DC: Technology & Outsourcing”), Legal 500 (recognized in the “Hall of Fame” for “Technology Outsourcing”) and Best Lawyers in America (recognized in “Information Technology Outsourcing”).

Chambers Global states that according to clients, Dan "provides very practical advice" and "has a calm and thoughtful demeanor no matter how stressful or critical a situation may seem." According to Chambers, "he is one of the premier outsourcing lawyers in the country" and "he has in-depth knowledge of the industry, he's very practical, very patient and calm, but at the same time a tenacious negotiator." Clients praise that "Daniel Masur understands our industry. He helps us understand what we should be worried about." Chambers USA has described Dan as a “phenomenal lawyer” and the "expert of experts". According to Chambers, clients say he is “an outsourcing powerhouse; he has always been the backbone of the practice and has his finger on the pulse of this market."

Dan joined Mayer Brown in 1997. From 1994 to 1997, he served as Vice President and General Counsel of I-NET, Inc., a rapidly growing provider of information technology, telecommunications and outsourcing services. Prior to I-NET, Dan was a partner in another Washington DC firm.

Dan is a frequent speaker and presenter at industry and legal conferences on sourcing and technology subjects.


  • Englisch
Thriving in an Age of Digital Transformation


Georgetown University Law Center, JD
Editor, Georgetown Law Journal

Marquette University, BA


  • District of Columbia