I can recommend without reservation Hiser + Kopits Hiser (HKH). We brought in HKH after another architect and a contractor failed to solve a critical problem in our house. HKH not only solved the problem, but significantly improved on our overall living space. We had purchased a 150-year old house in downtown baltimore that was four stories and divided into separate apartments. Our goal was to combine two of the apartments into one owner's unit and the only way to do this was by building a new internal stairway between two floors. Then challenge was that structurally the only place where the stairs could go was adjacent to an addition that had been built many years ago where the floors intentionally did not align by 4 feet. In other words, the stairway needed to incorporate three runs of stairs between four separate levels between the two floors we needed to move between. And all this while retaining the light loft-like look we had throughout the rest of the house. Complicated. The principal of the firm, Helen Hiser, spent significant time on the site, measuring, drawing, taking photos, talking with contractors, talking with us, and eventually came up with an elegant, functional, and solid solution. She worked with good cheer and humor and was always available for consultation with contractors. Sadly for HKH, the finished project looks like it has always been there, it is so well integrated into the fabric of the house. We have had preservation architects compliment us on retaining the original layout of the house, when in fact the original layout would have been cramped, dark, dangerous, and not come anywhere close to meeting either building codes or modern aesthetic sensibilities. Helen was a pleasure to work with and we would not hesitate to use her again.