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'''Marshall W. Lochbaum''' of Raleigh, North Carolina, is a software developer and programming language implementer. At University of North Carolina at Chapel Hill, he earned a Master of Computer Science degree, was distinguished with the highest honours in mathematics as a Bachelor in Mathematics and Computer Science with a minor in Physics, and received the 2013 Alfred T. Brauer and 2014 Archibald Henderson prizes. Lochbaum is the designer and implementer of the [[I]] programming language which generalizes the array and functional capabilities of [[J]] to deal with a much broader variety of data structures.
[[File:20190910-02-ML.jpg|thumb|right|[[Boolean function|Boolean algorithm]]s at [[Dyalog '19]].]]
'''Marshall Ward Lochbaum''' of Raleigh, North Carolina, is a software developer and programming language implementer. He is the designer and implementer of the [[I|I programming language]] which generalizes the array and functional capabilities of [[J]] to deal with a much broader variety of data structures.
== Career ==
== Career ==
Before joining Dyalog, Lochbaum programmed extensively in [[J]], both as a hobbyist and as a professional at ThomasNet and BEST, llc. He has also contributed to the J interpreter.
Before joining Dyalog, Lochbaum programmed extensively in [[J]], both as a hobbyist and as a professional at ThomasNet and BEST, llc. He has also contributed to the J interpreter.


Since February 2017, he has worked as a software developer at [[Dyalog Ltd.]], mainly on speeding up the implementation of [[Dyalog APL]], but also contributing to language development. He has achieved significant speed-ups across all parts of the language, implemented new primitives, and designed extensions to existing ones. He also is a frequent workshop host and presenter and [[Dyalog User Meeting]]s and other events.
At University of North Carolina at Chapel Hill, he earned a Master of Computer Science degree, was distinguished with the highest honours in mathematics as a Bachelor in Mathematics and Computer Science with a minor in Physics, and received the 2013 Alfred T. Brauer and 2014 Archibald Henderson prizes.
 
From February 2017 until June 2020, he worked as a software developer at [[Dyalog Ltd.]], mainly on speeding up the implementation of [[Dyalog APL]], but also contributing to language development. He has achieved significant speed-ups across all parts of the language, implemented new primitives, and designed extensions to existing ones. He was a frequent workshop host and presenter at [[Dyalog User Meeting]]s and other events.
 
After leaving Dyalog, Lochbaum has been developing the [[BQN]] language.
 
== Publications ==
== Publications ==
=== Notable software projects===
=== Notable software projects===
* [https://github.com/mlochbaum/JSound JSound]: J scripts for sound processing and synthesis
* [https://github.com/mlochbaum/JSound JSound]: J scripts for sound processing and synthesis
* [JtoLaTeX https://github.com/mlochbaum/JtoLaTeX]: LaTeX-formatted documents using J evaluation  
* [https://github.com/mlochbaum/JtoLaTeX JtoLaTeX]: LaTeX-formatted documents using J evaluation  
*   
* [[I|I language]]: a tacit functional programming language inspired by J
* [[BQN]]: a prototype language intended to improve on APL while rectifying its deficiencies. Uses Unicode [[glyph]]s, but has a different character set than APL.
 
=== Conference presentations ===
=== Conference presentations ===
* Jsoftware Conference 2012: [https://code.jsoftware.com/wiki/Community/Conference2012/Talks/ImageProcessing Image processing in J]
* Jsoftware Conference 2012: [https://code.jsoftware.com/wiki/Community/Conference2012/Talks/ImageProcessing Image processing in J]
* Jsoftware Conference 2014: Using Data as Code
* Jsoftware Conference 2014: Using Data as Code
* [[Dyalog '17]]: [https://dyalog.tv/Dyalog17/?v=2KnrDmZov4U D08: Moving Bits Faster in Dyalog 16.0]
* [[Dyalog '17]] D08: [https://dyalog.tv/Dyalog17/?v=2KnrDmZov4U Moving Bits Faster in Dyalog 16.0] ([https://www.dyalog.com/uploads/conference/dyalog17/presentations/D08_Moving_Bits_Faster_in_Dyalog_16.zip materials])
* [[Dyalog '18]]: [https://dyalog.tv/Dyalog18/?v=paxIkKBzqBU D08: Sub-nanosecond Searches Using Vector Instructions]
* [[Dyalog '18]] D08: [https://dyalog.tv/Dyalog18/?v=paxIkKBzqBU Sub-nanosecond Searches Using Vector Instructions]
* [[Dyalog '18]]: [https://dyalog.tv/Dyalog18/?v=-6no6N3i9Tg D15: The Interpretive Advantage]
* [[Dyalog '18]] D15: [https://dyalog.tv/Dyalog18/?v=-6no6N3i9Tg The Interpretive Advantage]
* LambdaConf 2019: Outer Product as an Introduction to APL and a Pretty Cool Thing in General
* LambdaConf 2019: [https://www.youtube.com/watch?v=WlUHw4hC4OY Outer Product as an Introduction to APL and a Pretty Cool Thing in General] ([https://mlochbaum.github.io/OuterProduct/ slides])
* [[Dyalog '19]]: [https://dyalog.tv/Dyalog19/?v=czWC4tjwzOQ D04: Tacit Techniques with Dyalog version 18.0 Operators]
* [[Dyalog '19]] D04: [https://dyalog.tv/Dyalog19/?v=czWC4tjwzOQ Tacit Techniques with Dyalog version 18.0 Operators] ([https://www.dyalog.com/uploads/conference/dyalog19/presentations/D04_Tacit_Techniques.zip slides (zip file)])
* [[Dyalog '19]]: [https://dyalog.tv/Dyalog19/?v=TqmpSP8Knvg D09: Implementing Reduction]
* [[Dyalog '19]] D09: [https://dyalog.tv/Dyalog19/?v=TqmpSP8Knvg Implementing Reduction] ([https://www.dyalog.com/uploads/conference/dyalog19/presentations/D09_Implementing_Reduction.zip slides (zip file)])
{{APL Community}}
 
{{APL community}}{{DEFAULTSORT:Lochbaum}}[[Category:People]][[Category:Dyalog Ltd. employees]][[Category:Designers]][[Category:Implementers]]
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