Plaisant, CatherineMushlin, RichardSnyder, AaronLi, JiaHeller, DanShneiderman, BenLifeLines provide a general visualization environment for personal histories. We explore its use for clinical patient records. A Java user interface is described, which presents a one-screen overview of a computerized patient record using timelines. Problems, diagnoses, test results or medications can be represented as dots or horizontal lines. Zooming provides more details; line color and thickness illustrate relationships or significance. The visual display acts as a giant menu, giving direct access to the data. (Also cross-referenced as UMIACS-TR-98-56)en-USTechnical Report