3717 Decatur Ave, Kensington, MD 20895 301-949-4900

Our Company


Perry G. Constantinides

Founder and President

After getting his business and marketing degree from University of Maryland, Perry worked for six years at Xerox Corporation, selling and training others. In 1976, Perry got excited about the barter industry and decided to open a barter organization in the Washington DC area. Under Perry’s leadership, BarterSystems has grown to become one of the largest and most respected independent barter exchanges in the country. Perry continues to be involved in the International Reciprocal Trade Association, having been on the Board of Directors, and now serves as the Chairman of the Ethics Committee, and also as a Universal Currency committee member.

Perry looks forward to continuing to grow BarterSystems. He welcomes your ideas concerning how BarterSystems can help your business profitably grow through barter, and attract additional desirable members as well. Traveling with his family, reading, listening to good music, and trying to improve his golf game are hobbies and interests that Perry enjoys.


Vanessa Gillette

Manager of Client Services

Vanessa relocated to Maryland from North Carolina. She attended Craven Community College majoring in Business Management with a minor in Psychology. Vanessa joined BSI in March, 1998 as an Administrative Assistant, a title which she held for 1 year before being promoted to her current position as Manager of Client Services in June, 1999.

Prior to that she worked as a Dental Assistant/Administrative Assistant for 6 years. Vanessa contributes towards satisfying the many administrative matters that prevail daily here at BarterSystems. You all will come to know her as a people person who is bright, courteous, friendly, business oriented, and always has a pleasant smile. Her most enjoyed hobbies and interests include spending time with family and friends, reading, listening to good music,mentoring young girls,feeding the homeless and she loves to travel. Her Motto is “Be The Change You Seek”.


Serena Constantinides

Broker/Travel Coordinator

Full-time mother/manager of two teenagers, Serena works part time in the BarterSystems Travel Department. After studying French at Eisenhower College she worked as a portrait photographer, legal assistant for a local developer and senior executive administrative assistant for an international healthcare company. After a hiatus at home when her children were born she returned to the workforce part time as a kindergarten enrichment teacher. Once the county transitioned to full day kindergarten she came to work at BarterSystems. She’s been traveling and bartering for many years and is delighted to help members turn their trade into travel.

Lillian Poplin

Senior Trade Broker

Prior to joining BarterSystems in January of 1995, Lillian worked in positions involving juggling numerous tasks and responsibilities at the same time, which helped prepare her for being a barter broker. Her degree in Business/Management led to work in government audits, procurement, cost analysis, and proposals; tasks which kept her living out of a suitcase and traveling constantly. Since landing at BarterSystems, she has enjoyed the opportunity to spend more time at home.

Andrew Effross

Trade Broker

Andrew has recently relocated here to the DC Metro area from the Eastern Shore. He brings with him an above average golf game, along with 12 years of customer service experience in the food service industry. He grew up in the Pocono Mountains and he earned his Bachelors of Science in Business Economics from Bloomsburg University in Pennsylvania. Even though the concept of barter is a whole new world for him, he loves it and enjoys working with his clients. Since Andrew is now working regular hours he says he can’t wait to finally enjoy evenings and weekends off to do the things he has never done before.

Linda Weil

Media Broker

Linda recently relocated to Maryland from New York. Linda brings a wealth of business knowledge and experiences to the BarterSystems organization. She has been written up in “Who’s Who of Barter”; received the “Noble Prize of Transaction” (Deals of the Century) and has been nominated for induction into the “Barter Hall of Fame.” Responsibility extends to servicing over 125 media/advertising accounts.

Karen Callahan


Karen is a fifth generation Washingtonian. With a diversified background in marketing, banking and sales. Karen brings to Barter Systems a customer service commitment and a personal touch. Dedicated to the needs of her clients, Karen is an enthusiastic member of our team. She is a Registered Trade Broker with the International Reciprocal Trade Association. When not working at BSI, she will most often be found at Rehoboth Beach. Travel, gardening and family are her passions.