In 1991 Jennifer Horn was hired for part time work at a plant nursery in Northern Virginia.  Within months she became hooked, and decided to study horticulture at Virginia Tech and to then pursue a Masters in Landscape Architecture from University of Georgia. 

From 1999 until 2009 Jennifer practiced landscape architecture in New York City.  Her professional experience included designing zoo exhibits for the Bronx Zoo; developing the ecological program for Fresh Kills Park on behalf of New York's Department of City Planning; and designing gardens, estates and parks for Edmund Hollander Landscape Architect and Deborah Nevins Associates

Jennifer is a regionally licensed landscape architect (Virginia, Maryland and Washington, DC) as well as in New York state.  Since founding JHLA in 2009, Jennifer has continued to design luxury landscapes for residences, communities and resorts. Active projects involve constant collaboration with local architects and contractors for projects in DC and the surrounding municipalities. Other projects include school courtyard designs for communities in Ocean City, New Jersey and Queens, New York. JHLA has also provided strategic planning documents for communities both near and far (Fairfax, Virginia and Lanai, Hawaii) so that the landscapes respond to the existing ecological conditions as responsibly (and beautifully) as possible. In 2017, Washingtonian Magazine named Jennifer a "woman to watch".

For every project, JHLA vigilantly adheres to the guiding principle that a landscape should respond to its adjacent architecture and its social and natural histories.



Reuben Herrera is a 2013 graduate from West Virginia University with a bachelor's in Landscape Architecture. After college, Reuben began working for a design-build firm in Doylestown, PA working in the surrounding counties and New Jersey where he gained substantial knowledge of installation, construction and management of high end residential landscape projects.

In 2015 Reuben made his way down to the DMV to join JHLA. Since becoming a member of the team, Reuben has worked his way up to project manager and enjoys working with clients on projects of all shapes and sizes. In his free time Reuben enjoys biking the area, watching and attending football games and occasionally sneaking into the Smithsonian National Zoo at night to grapple with the bears.


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Mike Molkenthin is a 2008 graduate of Iowa State University with a bachelor's in Landscape Architecture.  During his time at Iowa State, Mike took part in an exchange program at RMIT University in Australia and participated in a semester-long traveling studio studying Landscape Architecture in Malaysia, New Zealand, and Australia.

After college, Mike began his professional career in Australia with a focus on urban design and residential community development. Upon returning to the US he worked in the DMV where he developed his skills in multi-family residential development, mix used communities, luxury hotels, and corporate campuses.  Mike also has extensive experience in the design-build industry where he gained substantial knowledge of design, installation, and maintenance of high-end residential landscapes along Chicago’s north shore.

In 2017 Mike returned to the DMV to join JHLA and since becoming a member of the team he has been involved in a range of projects and enjoys developing complex details.  In his free time, you can find Mike in the Caribbean or in a far-off destination around the world.