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William James "Bill" Dally is an American computer scientist and educator. He currently works as a chief scientist at NVIDIA. In May 2020, he developed open-source ventilator that can be built with $400 in readily available parts.


Dally received the B.S. degree in electrical engineering from Virginia Tech. While working for Bell Telephone Laboratories he contributed to the design of the Bellmac 32, an early 32-bit microprocessor, and earned an M.S. degree in electrical engineering from Stanford University in 1981.[20] He then went to the California Institute of Technology (Caltech), graduating with a Ph.D. degree in computer science in 1986. At Caltech he designed the MOSSIM simulation engine and an integrated circuit for routing. While at Caltech, he was part of the founding group of Stac Electronics in 1983.[2]


From 1986 to 1997 Dally taught at MIT where he and his group built the J–Machine and the M–Machine, parallel machines emphasizing low overhead synchronization and communication. During his MIT times he claims to have collaborated on developing design of Cray T3D and Cray T3E supercomputers. He became the Willard R. and Inez Kerr Bell Professor in the Stanford University School of Engineering and chairman of the computer science department at Stanford.[3]

He developed a number of techniques used in modern interconnection networks including routing-based deadlock avoidance, wormhole routing, link-level retry, virtual channels, global adaptive routing, and high-radix routers. He has developed efficient mechanisms for communication, synchronization, and naming in parallel computers including message-driven computing and fast capability-based addressing. He has developed a number of stream processors starting in 1995 including Imagine, for graphics, signal, and Image processing, and Merrimac, for scientific computing.

Dally was elected a Fellow of the Association for Computing Machinery in 2002, and a Fellow of the IEEE, also in 2002. In 2003 he became a consultant for Nvidia for the first time and helped to develop GeForce 8800 GPU s series.[3] He received the ACM/SIGARCH Maurice Wilkes Award in 2000, the Seymour Cray Computer Science and Engineering Award in 2004, and the IEEE Computer Society Charles Babbage Award in 2006. In 2007 he was elected to the American Academy of Arts and Sciences, and in 2009 the National Academy of Engineering. He received the 2010 ACM/IEEE Eckert–Mauchly Award for "outstanding contributions to the architecture of interconnection networks and parallel computers."[5]

He has published over 200 papers as well as the textbooks "Digital Systems Engineering" with John Poulton, and "Principles and Practices of Interconnection Networks" with Brian Towles. He was inventor or co-inventor on over 120 patents.[20]

Dally's corporate involvements include various collaborations at Cray Research since 1989.

In May 2020, Dally released an open-source ventilator hardware design he developed in order to address the shortage resulting from the global coronavirus pandemic.


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