LEXINGTON, Mass., March 31, 2006 -- Steven H. Groves, 72, a physicist at the Massachusetts Institute of Technology's Lincoln Laboratory for more than 40 years, died on March 27 after being hit by an SUV on his daily bicycle commute to the lab, MIT announced. Born in Madison, Wis., Groves received his bachelor's degree from Antioch College in Ohio in 1957. He was known for his breakthrough research on the band structure of gray tin, published in 1963, the year he earned his PhD from Harvard University, according to the MIT statement. After a year as a research fellow at Harvard, he joined Lincoln Laboratory, where his work on crystal growth and semiconductor materials led to the fabrication of diode lasers and high-gain and high-speed photodetectors. He was looking forward to celebrating his 50th wedding anniversary in England in July with his wife, two children and four grandchildren, MIT said. A memorial service will be held in May. http://web.mit.edu/newsoffice/index.html