Q&A with Dawson Extension Agent Clark MacAllister Clark MacAllister has served with UGA Extension as the Agriculture and Natural Resources Agent for Dawson and Lumpkin Counties since 2012. He provides education and technical advice in all facets of agriculture, specializing in ornamental plants and landscapes, disease and insect diagnosis, tree health, orchard and vineyard management, and more. He also serves as the market manager for the Amicalola Regional Farmers Market in downtown Dawsonville.