José María Mateos Pérez is a Spanish researcher and a Ph.D. student in the Medical Imaging Laboratory of the Hospital General Universitario Gregorio Mara?ón (http://image.hggm.es), in Madrid, where his main research lines deal with automatic segmentation and kinetic analysis modeling of dynamic nuclear imaging sequences. He has also been an experienced ImageJ user and has developed several macros and plugins. One of them, jClustering, has been published in PLOS ONE, a peer-reviewed journal. When he has enough time to procrastinate, he also likes to develop data analysis tools in Python and R.

Javier Pascau received his Ph.D. from Polytechnic University in Madrid, in 2006, and is currently a visiting professor at Carlos III University in Madrid. He has been a part of the Biomedical Imaging and Instrumentation Group, a research laboratory with a multidisciplinary team of engineers, physicists, biologists, and physicians located both in the university and Hospital General Universitario Gregorio Mara?ón, (biig.uc3m.es). His research and teaching cover areas such as medical image processing, analysis, quantification, and multimodal registration, both in preclinical and clinical environments. He has been involved in the development of small animal PET and CT devices, and in the last few years he has led several projects on intraoperative radiation therapy and image guided surgery. He has authored more than 30 papers, published in peer-reviewed journals over the last 13 years.