Executive Committee

Immediate Past President


Landscape Architect

Mr. Casey has 15 years of experience serving both public and private-sector clients. His public-sector project experience includes masterplanning through implementation for public realm projects, cultural facilities, and historic sites that include secure federal campuses, courthouses, and museums. Private-sector projects include corporate headquarter facilities, urban streetscapes, and highly amenitized mixed-use and multi-family residential projects. In addition to projects throughout the Mid-Atlantic region, Mr. Casey has provided landscape architecture services for international projects in over 15 countries, including numerous new U.S. Embassy Compounds and Consulates. Michael specializes in managing projects from concept design through implementation, and leading multi-disciplinary teams on complex developments that integrate rooftop and courtyard amenities, perimeter security elements and advanced storm-water management solutions.

Michael earned his BLA in Landscape Architecture from Virginia Tech and is a Registered Landscape Architect in Maryland and Virginia.



Landscape Designer

Kerri designs residential and small-scale commercial projects in the metropolitan Washington, DC area. She has also been responsible for project management and crew oversight. Kerri has consulted with over 800 individual clients and successfully completed over 300 design/build projects. She enjoys working with people and is dedicated to each of their unique visions and needs.

Kerri graduated in 2011 from the College of Environmental Science and Forestry in Syracuse, NY with a Bachelor’s Degree in Landscape Architecture. She was an active member of the ASLA Student Chapter and served consecutive terms as Secretary and President of the chapter. Kerri has been an active member of the Potomac Chapter for the past 5 years, serving as member-at-large, committee chair, and president-elect.



Associate, MVLA

Matthew Johnston is a registered landscape architect with MVLA, an award-winning design firm in Alexandria, VA.  He received his Masters of Landscape Architecture and Masters of Urban Planning degrees from Virginia Tech, and is an enthusiastic member of the professional design community represented by the Potomac Chapter of ASLA.

Matt’s background in international relations, urban planning, and landscape architecture informs his commitment to bring the benefits of design to more people.  He previously served as Chapter Coordinator for the DC chapter of Architecture for Humanity, and he’s a member of the Potomac Yard Design Advisory Committee for the City of Alexandria, helping to shape development in a growing urban corridor.



Landscape Architect/PB

Rob Tilson, FASLA, PLA has held many positions for the Potomac Chapter. Most notably, he has served as a two-time President from 1993-1994, two-term Trustee from 1998-2003. While serving in these capacities, Rob represented the chapter on the Virginia Licensure Committee (1998-2001), 100 Parks/100 Years Program Committee (1998), and the Centennial Medallion Program Committee (1998). Rob also instituted and re-organized the Nominating Committee for the Chapter and served as Chairman from 2002 to 2003. He co-chaired the Host Committee for the 2010 ASLA National Meeting in Washington, DC.

Nationally, Rob has served in several capacities including ASLA Vice-President of Professional Practice from 2004-2005. During his tenure as Vice President, Rob helped launch the SITES initiative and revamped the Professional Practice Network program and led the Archive Committee to help establish the Fellows database. Rob also served as the Board of Trustees Representative on the Landscape Architecture Foundation Board (2003). In 2005, Rob was recognized as a Fellow for his service to the profession.

As Chapter Trustee, Rob will concentrate on increasing Chapter visibility with other allied professions, work to finalize our licensure status with the District of Columbia and serve as a leader within the ASLA Board of Trustees.

Rob received his Landscape Architecture degree from Purdue University and has been practicing landscape architecture in the Washington, DC metro area for over 30 years. Rob is licensed in Virginia.



Landscape Architect

Steve McLaughlin is a landscape architect from Silver Spring, Maryland, who has been practicing in the Baltimore/Washington National Capital Region for two decades.  Since January 2015 he has been fulfilling a contract with the U.S. Department of State to provide subject matter expertise in landscape architecture as a supervisor of site design for American diplomatic missions world-wide, and as a code official for landscape-related design standards.

Steve has previously been employed with several architecture, engineering, landscape architecture, and other consulting firms of various sizes; serving a broad mix of clientele including the Departments of State and Defense, and other federal agencies, for domestic and international projects ranging very widely in scale and scope.  In a self-employed capacity he has also designed residences, additions, decks, patios and gardens.  His first career was as a U.S. naval officer.

Steve has a bachelor’s degree in architecture from the University of Virginia and a master’s degree in landscape architecture from Louisiana State University; is certified by CLARB; and professionally registered in Maryland.  He was previously a member of the Maryland Chapter ASLA.



Landscape Architect

David received his Master of Landscape Architecture degree from the University of Virginia in 2008. In the private sector he has worked for local firms Michael Vergason Landscape Architects and Campion Hruby Landscape Architects. David recently formed his own firm, David Wooden Studio LLC, working on a combination of commercial, environmental and residential projects. In the public sector he worked for the District Department of Energy & Environment (DOEE). At DOEE he managed green infrastructure implementation projects on public lands (parks, schools and PROW) and private properties. He also helped coordinate the Green Area Ratio program as a training instructor, guidance author and plan reviewer. He is a Registered Landscape Architect in Maryland. His professional interests include green infrastructure, sustainability and parametric modeling.

Prior to becoming a landscape architect David was a Certified Public Accountant licensed in the District of Columbia and Kentucky. He worked for the financial services firm PricewaterhouseCoopers for 13 years with specialties in taxation and technology. He has a Bachelors and Masters in Accounting from the University of Kentucky.


Landscape Architect

Laurie Beth Donnachie earned a Bachelor’s of Landscape Architecture from The Pennsylvania State University in 2011. She is a licensed landscape architect in Virginia and Pennsylvania.  Laurie Beth is also an ISA certified Arborist and holds a certificate in Healthcare Garden Design.  Her work experience includes many phases of residential development spanning from neighborhood layout through private garden installation.

Landscape Architect

Carla Ellern, ASLA, LEED® AP BD+C is a registered landscape architect with Lila Fendrick Landscape Architects in Chevy Chase, MD. She received her Master’s in Landscape Architecture from the Graduate School of Design at Harvard and would like to spread the word about what landscape architects do through her involvement with Potomac ASLA. In the public sector, she worked for the Department of Environmental Protection (DEP), Montgomery County, Maryland in the RainScapes program where she worked with homeowners and communities to reduce stormwater runoff. She’s interested in improving the environment and people’s lives by expanding green infrastructure and sustainability in our landscapes.

Designer, Oehme, van Sweden

Lindsay Hand has worked as a designer with Oehme, van Sweden since 2017. At OvS, Lindsay is involved in multifamily housing developments, plazas, memorials, institutions, and residential gardens. Her primary areas of focus include planting design, hand-sketching, construction documentation, and technical management. She is a licensed Landscape Architect in the state of Colorado.

Ms. Hand earned a Bachelor of Science in Landscape Architecture from Colorado State University in 2017.

Landscape Architect, Rhodeside & Harwell

Jules Krinsky is a creative problem solver, landscape architect and urban designer who has worked in the Washington Metropolitan area since 2012.  Currently, Jules works as a Landscape Architect with the multi-disciplinary firm Rhodeside & Harwell in Alexandria, VA.  At Rhodeside & Harwell, Jules works on projects ranging from small local parks to US Embassy projects around the world and everything in between.

Jules received a bachelor’s degree in Landscape Architecture at the University of Georgia and a Master’s of Science in urban design at Georgia Tech.  He is a licensed Landscape Architect in the State of Maryland.

Partner, LandDesign

Stephanie is a Partner and Landscape Architect with LandDesign, based out Alexandria VA. Stephanie directs many of the firm’s large scale master planning projects, including long-range master planning to urban design solutions for some of the nation’s leading developers. As a creative design leader, she applies her knowledge by offering innovative approaches including state-of-the-art design tools to engage diverse stakeholders in building consensus and understanding. She enjoys working at a variety of scales throughout the design process, and remains uniquely involved in all stages of a project. Her experience includes urban design, park planning and design, community master plans, site planning, design guidelines and streetscapes, with an emphasis on utilizing green infrastructure techniques as storm water harvesting, roof gardens, stream restoration, native plants and natural treatment systems for bio-retention.  Several notable NCASLA and Tri-State chapter award winning projects include Camp Lake James, the Park at Pine Hill Business Campus and Dr. Wesley Grant Southside Center.  She currently is very involved in the design of several Tysons VA redevelopment projects.

After receiving her BLA from the University of Georgia in 2000, Stephanie spent the first portion of her professional career in California.  Stephanie has been a member of ASLA since 2005 when she was on an “emerging professional” panel at the Fort Lauderdale, FL Annual Meeting & Expo.  She currently participates on the ASLA national PR and Communications Advisory Committee, recently completed an ASLA 2015 Tellers Committee Appointment and in May 2014 served as a juror for the Virginia Tech MLA student awards at the WAAC (Washington + Alexandria Architecture Center).  Additionally, prior to moving to DC in 2011, she served as Mountain Section chair for the 23 western counties of the NC Chapter of ASLA and was a City of Asheville NC Greenway Commissioner.  She is currently active in several DC metro area organizations and initiatives including Built by Women DC, Urban Land Institute and the City of Alexandria VA Public Art Task Force.

A fun fact about Stephanie is that she was the unnamed “architect” who sketched an “instant city park” in this Washington Post story – here.

Landscape Architect, Smithsonian’s National Zoo and Conservation Biology Institute

Matthew Sellers is a 19-year resident of the DC area, moving here from Ohio for graduate school at Virginia Tech in Alexandria, VA. His education is in urban planning and landscape architecture. He is a landscape architect licensed in the state of Maryland, and member of ASLA. His professional history includes work with the landscape architecture firms Sephenson + Good (9 years) and Clinton & Associates (5 years). He also taught courses in the Landscape Design and Sustainable Landscapes program at George Washington University (12 years). Matthew’s experience includes the design and construction administration of residential gardens, public plazas, playgrounds, perimeter security master plans, multi-acre mixed-use neighborhood developments, and animal habitats. Currently he works in the Office of Planning and Strategic Initiatives at Smithsonian’s National Zoo providing thoughtful and creative planning and design solutions for the Zoo’s visitors and inhabitants.

Landscape Designer, Oehme, van Sweden

Michael Stelfox is a designer at Oehme, van Sweden. Previously he led community engagement in Virginia Beach as a Sea Grant Fellow with Clark Nexsen, assisted with a trail study for the National Park Service, and designed for single-family residential, multifamily residential, and commercial landscapes.

Michael earned his Bachelor’s of Landscape Architecture from Virginia Tech in 2018.

Landscape Architect, Associate | Ayers Saint Gross

The foundations of Abby’s career lie in her interests of sustainable design and the impacts of environmental and social geographies in the landscape. She is an alumna of Penn State University, where she obtained a BA in Landscape Architecture and minor in Geography. Her education fed her curiosities of how people relate to the landscape and use outdoor spaces, as well as the social and cultural aspects that societies have on the land at all scales. She has found the DMV area to be rich in opportunities to exploit her interests and use her design skills and education to create spaces for everyone.

Both her degree and minor were complimented by studying abroad and exploring places in North America, Europe, and Africa. Abby has experience in community design, commercial-residential design, campus design/planning, and high-end residential design in the Chesapeake Bay region. She is currently an Associate and Landscape Architect at Ayers Saint Gross, where she works primarily on college, university, and hospital campuses. Additionally, she is a member of the Public Relations Committee at Ayers Saint Gross and enjoys participating in the many volunteer and community opportunities there. She is co-chair of the Potomac ASLA Emerging Professionals Committee, likes to volunteer her time to the community when she can, and also takes interest in personal creative endeavors involving graphic design and photography.

Executive Director

Susan Newman

Prior to being named Executive Director of the Potomac Chapter of ASLA, Newman served as Executive Director of Corporate Facility Advisors (CORFAC International), an alliance of entrepreneurial commercial real estate firms. For more than 20 years, she was Secretary General (CEO) of the U.S. Chapter of the International Real Estate Federation (FIABCI), also serving as interim Secretary General for the international body during part of that time.

With more than 30 years in association management, Newman works with boards and volunteers and is responsible for the administration of the association, as well as membership retention and services.