Our Team

Mark S. Singel, President

Mark has been a contract lobbyist and a consultant since 1995. From 1987 through 1995, Singel was Lieutenant Governor and, for a period of time, Acting Governor of the Commonwealth. The only person in Pennsylvania history to serve as Acting Governor, Singel received high marks for his stewardship. He led the state by enacting the first modern workers’ compensation reform package, refinanced the state’s park system through the “Key 93” program, and helped launch the high-tech era with landmark telecommunications legislation. He was also instrumental in reducing state and local taxes, the implementation of a statewide 911 emergency phone system, and the creation of thousands of new jobs in recycling and environmental technologies. He was the original author of the state’s mortgage assistance bill that has saved 35,000 Pennsylvania homes.

Prior to his terms as Lieutenant Governor, Singel served six years in the Pennsylvania State Senate and was chief of staff to two members of the U.S. Congress.

Singel ran for U.S. Senate in 1992 and for Governor in 1994. He served as Chairman of the Pennsylvania Democratic Party from 1995-1998 and was the President of Pennsylvania’s Electoral College in January, 1997.

Upon leaving public service, he founded Singel Associates and later served as Managing Director of Public Affairs Management., playing key roles in the legislative and administrative processes of government from a different perspective.

Singel established The Winter Group in February, 2005 and has developed it into one of the most effective and prestigious government relations firms in the state. He continues to provide consulting services to clients in retail, hospitality and gaming, manufacturing, technology, energy, non-profits, and health care fields. Singel served as chairman of Governor Ed Rendell’s Transition Executive Committee and maintains strong personal and political ties with leaders at all levels today. These relationships allow him and his firm to maintain a “seat at the table” with the right decision makers. Singel maintains collegial relationships with key members of the House and Senate on both sides of the aisle and is a known Harrisburg “insider” with a reputation for getting results.

A magna cum laude graduate of Penn State, Singel continues to serve as an adjunct professor at the Harrisburg campus. He has served on the Boards of Penn State and St. Francis Universities and holds several honorary doctorate degrees. Singel is consistently listed as a key operative at the state level and is a regular commentator on local and statewide political broadcast programs. He is a sought-after speaker at both political and academic events and is active in numerous community and philanthropic activities.

Singel has been married to Jacqueline for over 30 years and has three children: Allyson, Jonathan, and Christopher.

Peg Callahan, Senior Partner

Peg Callahan is a Senior Partner at The Winter Group. She is a graduate of Bloomsburg University with a B. A. in Psychology and a Masters in Psycho-Social Science from Penn State University.

Peg brings to The Winter Group extensive experience in the legislative and political arenas. She worked with the Republican leadership in the Pennsylvania Senate and has served as a special assistant to the Pennsylvania Secretary for Commerce. She was also the Legislative Director for the Pennsylvania Housing Finance Authority. Her wide-ranging contacts are a valuable asset to the firm.

Among the many clients that Peg represents for The Winter Group a vast number of interests are represented, including health care professionals, non profit organizations, community and economic development concerns, the hospitality industry, and manufacturing companies. Some of her most recent successes include the enactment of the Clean Indoor Air Legislation ; Licensing of Massage Therapists; Prescriptive Authority for Licensed Mid- wives; Scope of Practice Legislation for Perfusionists and Heart and Lung Legislation for State Correctional Officers.

Peg also serves as trustee for New Hope Academy and a member of the Pennsylvania Domestic Relations Task Force.

Peg leads the legislative efforts for The Winter Group and maintains valuable relationships on both sides of the aisle. She is regarded as one of the premier lobbyists in Harrisburg.

Angie Mellott Armbrust, Senior Associate

Angie serves as Senior Associate for The Winter Group.  Her duties at The Winter Group include interaction with legislative and administrative officials in areas such as health care policy, economic development and tax policies, transportation issues, and procurement. Angie monitors regulatory developments, state contracts, and other state programs and communicates these items to clients on a regular basis. 

For several years, Angie also served as the Managing Director of a large professional association where she performed duties to assist with the general functions of the association. These duties included assisting the executive board and committee chairs as needed, responding to member inquiries, interacting with other associations, coordinating board meetings across the state throughout the year, and planning and managing twice-yearly conferences with 700+ attendees.

Angie graduated magna cum laude from the University of Pittsburgh at Johnstown with degrees in history and political science and a certificate in international studies. She completed her Masters of Public Administration at the University of Pittsburgh Graduate School of Public and International Affairs. Angie brings to The Winter Group a variety of work experience, including time spent in the US State Department’s Crisis Management Training office. 


Natalie Cook, Associate

Natalie Cook began working with The Winter Group in January 2007. Collecting and communicating information in a timely manner is a very important component of our services. Natalie precisely monitors the actions of the PA General Assembly providing information to our clients which is essential to our lobbying efforts. She creates and sends legislative tracking and updates to clients on a regular basis. Natalie also conducts in depth research on proposals and specific client issues.  She also coordinates advocacy days and works with legislative and administrative officials on several client issues.

Natalie graduated cum laude from Temple University with a degree in Political Science and a certificate in Political Economy. Her previous work experience includes a sales and client relations position at Tyco Electronics and an internship with the Italian Consulate in Philadelphia where she was involved in event planning and communications for the Consulate.


Jerome A. Stephens, Jr.

Jerome A. Stephens, Jr. holds a BS in Mathematics and Secondary Education from the University of Pittsburgh. He completed post-baccalaureate study in accounting, economics and business law at the University of Pittsburgh at Johnstown and St. Francis University and received a Master of Business Administration from Indiana University of Pennsylvania.

Mr. Stephens spent 33 years in the energy sector mainly focused on the procurement of coal and related goods and services. He spent 23 years with Pennsylvania Electric Company, its parent company, General Public Utilities and other company affiliates and 10 years with Edison Mission Energy. Stephens honed his skills in strategy development and execution during his highly successful career in the energy industry. He developed and executed strategies that lowered energy costs in excess of $1 billion.

Stephens currently operates his own consulting firm that provides a wide array of services including strategy development, sourcing, contract negotiation and contract administration. He works with The Winter Group on energy and business logistics matters.

Stephens is active in his community, serving on many boards and chairing many charity events. Current board memberships include Bishop Carroll Catholic High School (Chairman), Appalachian Youth Services (past treasurer) and Cresson Lake Playhouse (past Chairman). Stephens is also an adjunct professor of business and mathematics at Pennsylvania Highlands Community College.