Peter Spieler, MD, trained at the University of Basel, Switzerland, before specializing in Clinical Pathology at the Kantonsspital St. Gallen and University of Berne. After serving as Assistant Medical Director at the Pathology Institute in St. Gallen, he undertook further education in diagnostic cytology and research at the Karolinska Hospital in Stockholm. In 1980 he returned to become Head of the Cytology Department at the Kantonsspital St. Gallen and since 2002 has had additional responsibility for the professional management of the Cytologic Laboratory of the Regional Cancer Society. Dr. Spieler has accumulated enormous experience in clinical cytology during the course of more than 30 years' activity in the field. Around 100,000 fine-needle aspirations have been performed at his institution, and he has been personally involved in the broad use of ultrasound-guided aspiration and the continual application of new laboratory and diagnostic technologies to cytologic specimens. Matthias Rossle, MD, passed the German State Examination in Medicine in 1999 and in 2001 presented his Experimental Thesis to receive the title Doctor of Medicine from the Ludwig Maximilian University of Munich, Germany. He then undertook training in Clinical Pathology at the Institute of Pathology, Ludwig Maximilian University of Munich, and at the Institute of Pathology, Cantonal Hospital Lucerne, Switzerland. In 2006 Dr. Rossle received the German Board Certificate in Anatomical Pathology and then undertook further training in Clinical Cytopathology at the Institute of Pathology, Cantonal Hospital, St. Gallen, Switzerland, leading to procurement of the Swiss Board Certificate in Cytopathology. From 2008 to 2009 he was Staff Pathologist and Cytopathologist at the Institute of Pathology, Cantonal Hospital Lucerne, Switzerland. Since 2010 Dr. Rossle has served as Pathologist and Cytopathologist at the Institute of Surgical Pathology, University Hospital Zurich, Switzerland, with special research interest in head and neck pathology and cytopathology.