An Independent K-12 school on a beautiful wooded campus, 3 miles from Washington, D.C.

School News

Potomac cordially invites you to an exclusive screening of "The Human Instrument," episode three of the eight-part PBS series Soundbreaking. The event will take place on Friday, October 21, in EPAC and is hosted by executive producer David Langstaff and his wife, Cyndie, parents of Chris '06, Todd '08, and Will '15.

The episode "surveys the range of ingredients that go into a perfect vocal track," will focus on prominent artists including Adele, Amy Winehouse, Cher, and Kanye West, according to Soundbreaking's website.

The screening will run from 7:00 to 8:00 pm, followed by a talk-back with David. Those 21 and older are also invited to a pre-screening cocktail party, which will take place from 6 to 6:45 pm.

If you'd like to attend the event, click here to RSVP by October 12. Visit this YouTube link to view a trailer.

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The JASON Project has honored Mary Cahill, Middle and Intermediate School science teacher and Intermediate School academic dean, with its 2016 Education Leadership Award. Formerly a division of the National Geographic Society, the JASON Project (named for the mythical hero-explorer who captained the Argo) designs curriculum for K-12 inquiry-based STEM education, promoting learning "that mimics what scientists are doing in the field," Ms. Cahill says.

In a career spanning 35 years (28 of them at Potomac), Mary Cahill has become a master teacher and an advocate for inquiry-based learning in the sciences. She has served as a consultant for National Geographic since 1994, training teachers in Canada, Japan, and throughout the United States to effectively use various curricula produced by that organization and its affiliates, including the JASON Project, Crittercam, Giant Traveling Maps, and Geography Action. National Geographic has filmed Ms. Cahill's science lessons at Potomac as examples of best practices in teaching, and she taught a master class entitled "Exploring Your World with National Geographic" at the Chautauqua Institute in 2009. In addition, Ms. Cahill has worked with the National Science Resource Center's Biodiversity Academy since 2006.

At Potomac, Ms. Cahill partners with the Chesapeake Bay Foundation to offer her students unique and exciting learning opportunities. Under her direction, 6 th graders learn about an urban watershed through hands-on experiences at the Potomac and Anacostia Rivers; 7 th graders participate in an ecological restoration project involving underwater grass beds (they grow the grass from seed at school then transplant it along the lower Potomac); and 8 th graders spend three full days on a remote island in the Bay, working as "watermen" and "waterwomen" and learning about the connections between the Bay, its watershed, and broader environmental issues. She says, "The opportunity to have our students experience one of the most biologically productive estuaries in the world is a real treasure. When students mirror the kinds of research scientists are doing in the field, they see that they too can make a difference."

Ms. Cahill is a National Board Certified teacher; she has received a Woodrow Wilson Teaching Fellowship (1994), a Fulbright Fellowship to Japan (1997), and a Grosvenor Fellowship for travel to the Arctic Ocean (2009). Her undergraduate degree, in biology, is from Regis College,and she earned a master's degree in science education at Boston University

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Arlington Magazine named Madeline Dubelier '16 one of the 10 winners of its 2016 Extraordinary Teen Awards. The prosthetic hand with touch sensors that Dubelier created as part of the Science and Engineering Research Center (SERC) program at Potomac led to her distinction as a semifinalist in the 2016 Intel Science Talent Search. She is pictured with Gianmarco Terrones '15, who was also a semifinalist in the 2016 Intel Science Talent Search.

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Potomac Spotlight

Marjorie Brennan, MD, is a physician specializing in pediatric anesthesiology at Children's National Medical Center and an assistant professor of anesthesiology and pain medicine at The George Washington University. A nationally known speaker on issues of health equity in the developing world, she is the founder and director...

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Without a suit and tie and a clipboard, it's hard to distinguish Ross Condon '03 from the players he coaches. It's early December and Ross is breaking a sweat preparing the players on the Penn State men's basketball team to take on George Washington University. He's decked out...

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By the Numbers


K-12 Program


90 Acre Campus

1,060 Students

in four divisions

22 Sports

67 Athletic Teams

$4.8 million

in need-based aid


Neighborhood bus routes serving Virginia, DC, and Maryland


Shuttle Bus Routes providing bus service each morning
and from 3:15 – 7:45 pm

Rated #1

independent school in Virginia