Hans B. (Teddy) Puttgen, inaugural director of the Energy Center at Ecole Polytechnique Federale De Lausanne (EPFL), the Swiss Federal Institute of Technology, will speak at Virginia Tech on Friday, April 13, at 2:30 p.m. in 3100 Torgersen Hall, as part of the speaker series sponsored by the Deans' Task Force on Energy Security and Sustainability.