Dr. Heilen is specialized in patent preparations and prosecutions in the areas of semiconductors, engines, chemical processes, mechanical, and electro-mechanical fields. She has extensive experience in water purification technologies, solar energy, nanocrystalline semiconductor particles, LCDs, polymers, nanotechnology, synthesis of organometallic products, and thin films.

Over a decade, Dr. Heilen supported various projects in patent litigations, civil litigations, e-discovery support, collaborative investigations with the U.S. federal government, such as the Department of Justice, and advising Japanese professionals on their scientific writings. She also worked for a Trademark law firm where she assisted with trademark prosecutions and analyzed trademark foreign filing oppositions.