{{Short description|American computer scientist}}

{{Infobox scientist | name = Darrell Don Earl Long | image = Professor Darrell Long in 2022.jpg | image_size = 200px | birth_date = | birth_place = | alma_mater = San Diego State University {{small|(B.S. 1984)}}<br> University of California, San Diego {{small|(M.S. 1986)}}, {{small|(Ph.D. 1988)}} | doctoral_advisor = Jehan-François Pâris | doctoral_students = Randal Burns | known_for = Computer Data Storage | awards = IEEE Fellow (2006)<br/>AAAS Fellow (2008) | spouse = {{Plainlist | *{{marriage|Mary Long|1984|2014|end=died}}<ref>{{Cite web |url=https://scmemorial.com/tribute/details/1233/Mary-Long/obituary.html |title=Obituary of Mary Katherine Long |access-date=2022-06-28 |archive-date=2022-06-28 |archive-url=https://web.archive.org/web/20220628214902/https://scmemorial.com/tribute/details/1233/Mary-Long/obituary.html |url-status=live }}</ref> *{{marriage|Elaine Long|2016}} }}| | field = Computer Science<br> Computer Engineering | work_institution = University of California, Santa Cruz <br> Université Paris–Dauphine <br> Conservatoire National des Arts et Métiers <br> Université Paris–Descartes | prizes = }} '''Darrell Don Earl Long''' is an American computer scientist and computer engineer who is the inaugural holder of the Kumar Malavalli Endowed Chair of Storage Systems Research and Distinguished Professor Emeritus of Engineering at the University of California, Santa Cruz.<ref name="profile">{{Cite web|url=https://campusdirectory.ucsc.edu/cd_detail?uid=darrell|title=Darrell Long Faculty Profile|access-date=2023-04-05}}</ref> He was editor-in-chief of the IEEE Letters of the Computer Society<ref>{{Cite web|url=https://www.computer.org/web/locs|title=CSDL &#124; IEEE Computer Society|date=12 November 2008 |access-date=2017-11-14|archive-date=2017-11-15|archive-url=https://web.archive.org/web/20171115143524/https://www.computer.org/web/locs|url-status=live}}</ref> and was editor-in-chief of the ACM Transactions on Storage<ref>[http://tos.acm.org Transactions on Storage] {{Webarchive|url=https://web.archive.org/web/20190415153416/https://tos.acm.org/ |date=2019-04-15 }}, retrieved 2012-04-07.</ref> (TOS). In 2002, he was the founder of the Conference on File and Storage Technologies (FAST).

==Biography== Long did his undergraduate studies at San Diego State University, graduating in 1984, and went on to graduate studies at the University of California, San Diego, earning a Ph.D. in 1988 under the supervision of Jehan-François Pâris.<ref name="mathgene">{{MathGenealogy}}</ref>

While in graduate school, he worked as a lecturer in mathematics at San Diego State University and in computer science at the University of California, San Diego. After earning his Ph.D. he joined the faculty of the University of California, Santa Cruz. At UCSC, he has been associate dean for research and graduate studies in the Jack Baskin School of Engineering,<ref name="aaas-ucsc"/> and he is Director ''emeritus'' of the Storage Systems Research Center.<ref name="ssrc.ucsc.edu">[http://www.ssrc.ucsc.edu/faculty.html UCSC Storage Systems Research Center faculty] {{Webarchive|url=https://web.archive.org/web/20120213075123/http://www.ssrc.ucsc.edu/faculty.html |date=2012-02-13 }}, retrieved 2012-12-15.</ref> During his tenure at the SSRC, seven women earned Ph.D's in the program, which is noteworthy in the field of Computer Science, where women are significantly underrepresented.<ref>[http://news.ucsc.edu/2016/03/women-computer-science.html Female computer science grad students find supportive environment at UC Santa Cruz] {{Webarchive|url=https://web.archive.org/web/20160314150643/http://news.ucsc.edu/2016/03/women-computer-science.html |date=2016-03-14 }}, retrieved 2021-08-19.</ref>

Long has held visiting faculty positions at the Université Paris–Dauphine (Paris IX), the Conservatoire National des Arts et Métiers, the Université Paris–Descartes (Paris V), Sorbonne Université (Pierre et Marie Curie, Paris VI), the University of Technology, Sydney, the Center for Communications Research, the United States Naval Postgraduate School and is Professor ''ad Honorem'' de la Universidad Católica del Uruguay.<ref>[http://darrelllong.github.io/cv.pdf Curriculum Vitae], retrieved 2025-07-07.</ref>{{better source needed|date=August 2021}} He is an Associate Member of the European Organization for Nuclear Research (CERN).

Long served as the Vice-Chair<ref>[https://senate.universityofcalifornia.edu/_files/committees/ucorp/ar/ucorp01-02ar.pdf UCORP Annual Report 2001-2002] {{Webarchive|url=https://web.archive.org/web/20210820054627/https://senate.universityofcalifornia.edu/_files/committees/ucorp/ar/ucorp01-02ar.pdf |date=2021-08-20 }} retrieved 2021-08-19.</ref> and then Chair of the University of California Committee on Research Policy.<ref>[https://senate.universityofcalifornia.edu/_files/committees/ucorp/ar/ucorp02-03ar.pdf UCORP Annual Report 2002-2003] {{Webarchive|url=https://web.archive.org/web/20210820054626/https://senate.universityofcalifornia.edu/_files/committees/ucorp/ar/ucorp02-03ar.pdf |date=2021-08-20 }} retrieved 2021-08-19.</ref> He has served on the University of California President’s Council on the National Laboratories,<ref>[https://regents.universityofcalifornia.edu/regmeet/sep04/203.pdf List of 2004 members of the University of California President’s Council on the National Laboratories] {{Webarchive|url=https://web.archive.org/web/20210820054624/https://regents.universityofcalifornia.edu/regmeet/sep04/203.pdf |date=2021-08-20 }} retrieved 2021-08-19.</ref> and on the Science & Technology, National Security and Intelligence committees for those laboratories. He served for many years on the National Research Council's Standing Committee on Technology Insight-Gauge, Evaluate, and Review (TIGER), and the Committee on Defense Intelligence Agency Technology Forecasts and Reviews. He served on the National Research Council's Committee on Science and Technology for Defense Warning. He was a member of the United States Army Laboratory Assessment Group (ALAG) and the United States Army Technology Objectives review panel. He is a member of the Intelligence Science and Technology Experts Group (ISTEG) for the National Academies of Sciences, Engineering and Medicine.{{citation needed|date=August 2021}} He is a member of the advisory group JASON.<ref>[http://fas.org/irp/agency/dod/jason/ JASON Defense Advisory Panel Reports] {{Webarchive|url=https://web.archive.org/web/20140827045757/http://fas.org/irp/agency/dod/jason/ |date=2014-08-27 }} retrieved 2014-8-6.</ref>

==Research== Long's research interests include computer data storage, operating systems, distributed computing, and computer security.<ref name="aaas-ucsc"/> In 1991,<ref>{{citation | last1 = Cabrera | first1 = Luis-Felipe | last2 = Long | first2 = Darrell D.E. | contribution = Swift: A Distributed Storage Architecture for Large Objects | pages = 123–128 | title = Proc. 11th Symposium on Mass Storage Systems (MSS) | doi = 10.1109/MASS.1991.160223 | year = 1991| isbn = 978-0-8186-2155-0 | s2cid = 44826105 | url = https://escholarship.org/uc/item/0t40831n }}.</ref> Long worked on the idea of storing metadata separately from data in the Swift file system.<ref>{{citation | last1 = Long | first1 = Darrell D.E. | last2 = Montague | first2 = Bruce | last3 = Cabrera | first3 = Luis-Felipe | contribution = Swift/RAID: A Distributed RAID System | pages = 331–359 | title = Computing Systems | year = 1994| volume = 7 | citeseerx = 10.1.1.53.7183 }}.</ref> This idea became a central design concept in subsequent distributed file and storage systems, including two projects on which Long was a major contributor: IBM TotalStorage/SAN (Storage Tank) and Ceph. The Ceph<ref name="ceph">{{citation | last1 = Weil | first1 = Sage A. | last2 = Brandt | first2 = Scott A. | last3 = Miller | first3 = Ethan L. | last4 = Long | first4 = Darrell D. E. | last5 = Maltzahn | first5 = Carlos | contribution = Ceph: a scalable, high-performance distributed file system | pages = 307–320 | title = Proc. 7th USENIX Symp. Operating Systems Design and Implementation | url = http://www.ssrc.ucsc.edu/Papers/weil-osdi06.pdf | year = 2006 | access-date = 2012-02-26 | archive-date = 2012-03-09 | archive-url = https://web.archive.org/web/20120309021423/http://www.ssrc.ucsc.edu/Papers/weil-osdi06.pdf | url-status = live }}.</ref> distributed file system was first designed and implemented in the Storage Systems Research Center in 2006<ref>[https://www.ssrc.ucsc.edu/proj/ceph.html SSRC Exascale Storage Research] {{Webarchive|url=https://web.archive.org/web/20090429055316/http://www.ssrc.ucsc.edu/proj/ceph.html |date=2009-04-29 }} retrieved 2021-08-20.</ref> by Sage Weil and other members of the SSRC under the direction of Long, Professor Ethan Miller, Professor Scott Brandt, and Dr. Carlos Maltzahn. Long has done further research on metadata for exascale file systems<ref>{{citation |first1 = Aleatha |last1 = Parker-Wood |first2 = Brian |last2 = Madden |first3 = Michael |last3 = McThrow |first4 = Darrell D. E. |last4 = Long |first5 = Ian |last5 = Adams |first6 = Avani |last6 = Wildani |contribution = Examining Extended and Scientific Metadata for Scalable Index Designs |title = Proceedings of the 6th International Systems and Storage Conference (SYSTOR 2013) |url = https://www.ssrc.ucsc.edu/pub/parkerwood-systor13.html |year = 2013 |access-date = 2022-06-07 |archive-date = 2021-12-14 |archive-url = https://web.archive.org/web/20211214100339/https://www.ssrc.ucsc.edu/pub/parkerwood-systor13.html |url-status = live }}</ref> and security for exascale file systems.<ref>{{citation | last1 = Li | first1 = Yan | last2 = Dhotre | first2 = Nakul | last3 = Ohara | first3 = Yasuhiro | last4 = Kroeger | first4 = Thomas | last5 = Miller | first5 = Ethan L. | last6 = Long | first6 = Darrell D. E. | contribution = Horus: Fine-Grained Encryption-Based Security for Large-Scale Storage | title = Proc. 11th Conference on File and Storage Systems (FAST 2013)) | url = http://www.ssrc.ucsc.edu/pub/li-fast13.html | year = 2013 | access-date = 2022-06-07 | archive-date = 2021-12-14 | archive-url = https://web.archive.org/web/20211214074547/https://www.ssrc.ucsc.edu/pub/li-fast13.html | url-status = live }}</ref>

Long worked on data deduplication, having worked on deduplication and delta compression for reducing the storage demands for backup<ref>{{citation | first1 = Randal C. | last1 = Burns | first2 = Darrell D. E. | last2 = Long | contribution = Efficient distributed backup with delta compression | title = Proceedings of the 5th Workshop on I/O in Parallel and Distributed Systems (IOPADS '97) | year = 1997 | pages = 27–36 | doi = 10.1145/266220.266223 | isbn = 0-89791-966-1 | s2cid = 1298161 | doi-access = free }}</ref> and long-term data storage.<ref>{{citation |first1 = Lawrence |last1 = You |first2 = Kristal |last2 = Pollack |first3 = Darrell D. E. |last3 = Long |contribution = Deep Store: An Archival Storage System Architecture |title = Proceedings of the 21st International Conference on Data Engineering (ICDE '05) |year = 2005 |url = https://www.ssrc.ucsc.edu/pub/you-icde05.html |access-date = 2021-08-20 |archive-date = 2021-08-20 |archive-url = https://web.archive.org/web/20210820173614/https://www.ssrc.ucsc.edu/pub/you-icde05.html |url-status = live }}</ref> He also contributed to techniques for scaling deduplication for very large backup systems.<ref>{{citation |last1 = Bhagwat |first1 = Deepavali |last2 = Eshghi |first2 = Kave |last3 = D. E. Long |first3 = Darrell |last4 = Lillibridge |first4 = Mark |contribution = Extreme Binning: Scalable, Parallel Deduplication for Chunk-based File Backup |url = http://www.ssrc.ucsc.edu/pub/bhagwat-mascots09.html |title = (MASCOTS 2009) |year = 2009 |access-date = 2017-03-08 |archive-url = https://web.archive.org/web/20170308223858/http://www.ssrc.ucsc.edu/pub/bhagwat09-mascots.html |archive-date = 2017-03-08 }}</ref>

Beyond these areas, Long has written research papers on web caching,<ref>{{citation | last1 = Kroeger | first1 = T.M. | last2 = Long | first2 = D.D.E. | last3 = Mogul | first3 = J.C. | contribution = Exploring the bounds of web latency reduction from caching and prefetching | title = Proc. USENIX Symp. Internet Technologies and Systems | url = http://static.usenix.org/publications/library/proceedings/usits97/full_papers/kroeger/kroeger.pdf | year = 1997 | access-date = 2012-02-26 | archive-date = 2016-03-04 | archive-url = https://web.archive.org/web/20160304191331/http://static.usenix.org/publications/library/proceedings/usits97/full_papers/kroeger/kroeger.pdf | url-status = live }}.</ref> power-aware hard disk management in mobile computing,<ref>{{citation | last1 = Helmbold | first1 = David P. | last2 = Long | first2 = Darrell D. E. | last3 = Sherrod | first3 = Bruce | title = Proceedings of the 2nd annual international conference on Mobile computing and networking | contribution = A dynamic disk spin-down technique for mobile computing | doi = 10.1145/236387.236423 | pages = 130–142 | year = 1996| isbn = 978-0897918725 | s2cid = 7877062 | url = https://escholarship.org/uc/item/777859c2 | url-access = subscription }}.</ref> and low-bandwidth multicast techniques for video on demand,<ref>{{citation | last1 = Paris | first1 = J.-F. | last2 = Carter | first2 = S.W. | last3 = Long | first3 = D.E. | title = Proceedings 7th International Conference on Computer Communications and Networks (Cat. No.98EX226) | contribution = A low bandwidth broadcasting protocol for video on demand | doi = 10.1109/ICCCN.1998.998831 | pages = 690–697 | year = 1998| isbn = 978-0-8186-9014-3 | s2cid = 8520094 }}</ref> among other topics.

==Awards and honors== Long became an IEEE Fellow in 2006 "for contributions to storage systems architecture and performance".<ref>[http://www.ieee.org/membership_services/membership/fellows/alphabetical/lfellows.html List of IEEE Fellows] {{Webarchive|url=https://web.archive.org/web/20120301162045/http://www.ieee.org/membership_services/membership/fellows/alphabetical/lfellows.html |date=2012-03-01 }}, retrieved 2012-12-15.</ref> In 2008 he was inducted as a fellow of the American Association for the Advancement of Science.<ref name="aaas-ucsc">[http://news.ucsc.edu/2008/12/2641.html Three USC professors elected AAAS Fellows] {{Webarchive|url=https://web.archive.org/web/20111023040315/http://news.ucsc.edu/2008/12/2641.html |date=2011-10-23 }}, Tim Stephens, UCSC University News, December 17, 2008, retrieved 2012-02-25.</ref>

==Philanthropy== In 2022, Darrell Long and his wife Elaine established the Darrell and Elaine Long Endowment to promote excellence in the physical sciences and engineering.<ref>{{cite web|url=https://www.physics.ucsc.edu/support-us/darrell-and-elaine-long.html|title=Darrell and Elaine Long - UC Santa Cruz - Physics Department|access-date=2025-07-04}}</ref> The endowment supported two annual awards—the Long Prize in Experimental Engineering and the Long Prize in Experimental Physics—given beginning in 2022 for the most outstanding doctoral dissertations in each field.<ref>{{cite web|url=https://engineering.ucsc.edu/news/alison-tang-wins-dissertation-prize/|title=Inaugural dissertation prize in experimental engineering awarded to BME Ph.D. candidate Alison Tang|access-date=2025-07-04}}</ref><ref>{{cite web|url=https://engineering.ucsc.edu/news/experimental-engineering-phd-prize/|title=Electrical engineer wins prize for best Ph.D. dissertation in experimental engineering|access-date=2025-07-04}}</ref> In June 2025, the endowment was expanded to create the Long Family Professorship in Experimental Physics. The inaugural chairholder was Bruce A. Schumm, Distinguished Professor of Physics.<ref>{{cite web|url=https://www.physics.ucsc.edu/support-us/faculty-chairs-and-professorships.html|title=Faculty Chairs and Professorships - UC Santa Cruz - Physics Department|access-date=2025-07-04}}</ref>

==References== {{Reflist}}

==External links== *[https://darrelllong.github.io/ Home page] *[https://scholar.google.com/citations?user=PqdLgQ0AAAAJ Citations] at Google Scholar *[https://ucsc.academia.edu/DarrellLong/ Publications] at Academia.edu *[http://genealogy.math.ndsu.nodak.edu/id.php?id=10794 Students and Advisors] at Mathematics Genealogy Project *[https://orcid.org/0000-0002-0822-0740 ORCID]

{{Authority control}}

{{DEFAULTSORT:Long, Darrell D. E.}} Category:Living people Category:American computer scientists Category:San Diego State University alumni Category:University of California, San Diego alumni Category:University of California, Santa Cruz faculty Category:Fellows of the IEEE Category:Fellows of the American Association for the Advancement of Science Category:1962 births Category:Members of JASON (advisory group)