L. Arthur D'Asaro received a Masters degree in Physics from Northwestern University and a PhD in Engineering Physics from Cornell University in 1955. He joined Bell Telephone Laboratories, Murray Hill, NJ in that year and continued at Bell Labs for the next 41 years. During that time he worked on a wide variety of semiconductor devices. In the mid-1950s he co-developed (with Ian Ross and Howard Loar) an integrated silicon multi-transistor counting device called a stepping transistor, using photolithography and diffusion. Some additional devices to which he contributed were: optical isolators, single mode stripe geometry semiconductor lasers, Schottky barrier microwave diodes, high power microwave via-transistors, guard-ring avalanche multiplication photodiodes, massively parallel optoelectronic integrated circuit arrays, VCSELs and large VCSEL arrays. Until recently he was a Distinguished Member of Technical Staff at Princeton Optronics, where he continued to work on high power VCSELs and VCSEL arrays.