Bernie Marczyk joined Cornerstone's Annapolis office in December 2018. Most recently, Bernie served as the director of government affairs for Anne Arundel County Executive Steve Schuh. In this role, he worked closely with the County Council and Maryland General Assembly to advance legislative initiatives and implement public policies for the County.

Prior to working for the County Executive, Bernie worked for Ducks Unlimited for seven years as a federal and state lobbyist and thenin managing the organization's conservation delivery in the Atlantic Region (Maryland to Maine). In this role he was responsible partnering with federal, state, and non-profit organizations on land acquisition and wetland restoration projects on private lands or public lands such as Blackwater National Wildlife Refuge.

Bernie began his professional career working for then-Congressman Bob Ehrlich first as a legislative assistant on Capitol Hill and then as a policy advisor for Governor Ehrlich in Annapolis where he oversaw the legislative and policy efforts of the Departments of Agriculture, Environment, Natural Resources, Planning, and Transportation. Bernie also worked on multiple statewide and local elections in Maryland.

A graduate of Princeton University, Bernie and his wife Keely live on Maryland's Eastern Shore with their nine-year-old daughter Leah, seven-year-old twins Claire and Tommy, and three-year-old daughter Stella. Bernie is an active volunteer at St. Christopher's Catholic Church and as a basketball, soccer, and softball coach.

Ellen Valentino joined Cornerstone's Maryland team in December 2019. She brings to Cornerstone more than 30 years of lobbying expertise in Maryland, Delaware and the District of Columbia. Ellen represents diverse business interests from small businesses to the energy sector to beverage companies. She focuses her work on protecting client interests through practical policy change, coalition-building, issue positioning and political strategy.

Prior to joining Cornerstone, Ellen founded and operated her own legislative and association management consulting firm, Valentino-Benitez & Associates (VBA, Inc.), for more than 28 years. As president of the firm, Ellen advocated for clients and built trusted relationships and coalitions to represent their interests in matters before the District of Columbia City Council, the Maryland and Delaware legislatures, and local governments.

In addition to representing various clients, Ellen currently serves as the executive vice president for the Maryland-Delaware-District of Columbia Beverage Association and the Mid-Atlantic Petroleum Distributors Association.

Ellen began her professional career as an executive in grassroots lobbying management with the Greater Washington/Maryland Service Station and the Automotive Repair Association. In 1991, she established her own legislative and association management consulting firm.

A life-long Maryland resident, Ellen is a graduate of Catholic University. She is married to Robert Benitez and they have two daughters.

Lauren Vella joined Cornerstone in January of 2025, launching the firm's Delaware office and expanding our Mid-Atlantic reach and capabilities.

Prior to Cornerstone, Lauren served as Chief of Staff to the University President at the University of Delaware (UD).

Lauren also served as Chief of Staff to the Speaker of the House in the Delaware House of Representatives, where she managed the staff of the Majority Caucus and was the chief advisor to House Majority Caucus Leadership to shape and achieve their policy and political goals. Lauren served Attorney General Kathy Jennings as Policy & Legislative Director for the Delaware Department of Justice during Jennings' first term where she managed the significant legislative agenda for the department.

Lauren holds a Master of Public Administration from the University of Pennsylvania and an Honors Bachelor of Arts in Political Science from the University of Delaware.