CV

I'm a research associate in computer science and head the Network Architectures group at the chair for Communication and Distributed Systems at RWTH Aachen University. Before I was with Anja Feldmann at TU Berlin / Deutsche Telekom Innovation Laboratories. I was a visiting scholar at the group of Paul Barford at the University of Wisconsin - Madison, USA.

I studied computer science at Darmstadt University of Applied Sciences, Institute Eurecom (Sophia Antipolis, France) and Darmstadt University of Technology and hold a Bachelor of Science (B.Sc.) and Master of Science (M.Sc.) degree. From 2004 to 2006 I was with the Fraunhofer IGD where I worked on network architectures for telemedical applications. I obtained a Ph.D. (Dr. rer. nat.) from TU Berlin in 2013 (Advisor: Anja Feldmann).

News

2018-04: misc APNIC blog post Adoption, performance, and human perception of HTTP/2 Server Push appeared
2018-04: teaching Teaching Internet Architecture and Performance this semester
2018-03: service CoNEXT 2018 TPC
2018-03: paper Certificate Authority Authorization (CAA) adoption study accepted at SIGCOMM CCR (with live measurements). [paper]. Joint work with TU Munich, U Sydney, U Twente, Surfnet, and Northeastern University.
2018-03: paper Our measurement based analysis of objectionable/illegal content in Bitcoin's block chain got featured by the morning paper, The Guardian, The Register, Sky News, PCMag, The Outline, and engadget.de, more (Financial Crypto'18 paper)
2018-03: misc Jan and Torsten will present the QUIC, HTTP2, and TCP IW measurements at IETF 101 in London
2018-01: paper 2 PAM paper and 1 poster accepted
2018-01: service TPC invitations: IEEE QoMEX, Internet-QoE, ACM MobiSys MobiArch
2017-12: paper How to give (cloud) customers control over their data? Joint paper with F-Secure, Orange Poland, CERN, HPI, Aalto University accepted at IEEE IC2E.
2017-12: paper Congrats to Roman et al. whose paper on Bitcoin measurements was accepted at Financial Crypto
2017-11: talk Invited talk on HTTP2 @ Munich Internet Research Retreat Raitenhaslach
2017-11: service TPC of 21st IEEE Global Internet Symposium & TMA Shadow PC Co-Chair
2017-10: We'll present a paper on TCP IW measurements and a poster on social network measurements at IMC.
2017-09: service Invited to serve as Poster and Demo Co-Chair for SOSR (with Theo Benson)
2017-08: talk Delighted to give a keynote talk at ACM SIGCOMM Internet-QoE
2017-08: talk We'll present our HTTP2 measurement + QoE work at ICSI / UC Berkeley on Thursday, August 17, 2017, 1:30 PM
2017-08: service Invited to serve as Area TPC Co-Chair for the Network Measurements and Big Data track at ITC30 (with Fabian Bustamante and David Malone)
2017-08: service Serving on the TPC of PAM 2018
2017-07: service Serving on the TPC of CoNEXT CAN 2017 workshop
2017-04: service I am co-organizing this years IMC Shadow PC. Please apply by May 26th!
2017-04: paper New TMA paper: measurement of cloud email (Github: code+data).

Research Interests

My research focuses on internet measuremet and management, with an emphasis on improving service quality.

Software Defined Networking / Network Functions Virtualization
Internet Measurement
Quality of Experience / Video & Audio Quality Assessment
Low Latency Networking
Spam
Web Caching

Projects

	Principal Investigator and member of the general assembly: SSICLOPS Scalable and Secure Infrastructures for Cloud Operations (funded by the EU under Horizon 2020, 2015-2018) The project provides funding for 2 PhD positions
	Principal Investigator: DFG Collaborative Research Center SFB 1053 MAKI MAKI – Multi-Mechanisms Adaptation for the Future Internet 2017-2020(Entry in GPRIS project database) The project provides funding for 1 PhD position

Awards / Grants

03/2009 - Master's Thesis Award (PDF) (Award Homepage)
Communication in Distributed Systems (KuVS) Group

03/2010 - Master's Thesis Award (Award Announcement Conference Report)
GI/ITG Measurement, Modelling and Evaluation of Computing Systems group.

2011: Student Travel Grant: IEEE INFOCOM, Shanghai, China

Professional Services

Organizing Committees

2018: Publicity Chair: Network Traffic Measurement and Analysis Conference (TMA)
2018: Shadow PC Co-Chair: TMA Shadow PC 2018 (31 PC members)
2017: Shadow PC Co-Chair: IMC Shadow PC 2017 (45+ PC members around the world) [with Ethan Katz-Bassett and Hamed Haddadi]
2017: Organizer: Dagstuhl seminar 17032: Network Function Virtualization in Software Defined Infrastructures
2017: ITC29 Publicity Chair
2017: NetSys PhD Forum Chair
2016: PQS Special Session Chair PQS 2016 special session on Gaming

TPC Chair

2018: Area TPC Co-Chair: ITC 30: Network Measurements and Big Data track[with Fabian Bustamante and David Malone]
2018: Demo+Poster Co-Chair: Symposium on SDN Research (SOSR) (with Theophilus Benson, Brown University)
2017: IEEE IM: QoE Management Workshop IFIP/IEEE International Symposium on 2017 Integrated Network Management: Workshop QoE Management
2017: SDNFlex: Workshop on Software-Defined Networking and Network Functions Virtualization for Flexible Network Management (SDNFlex) [co-located with NetSys 2017]
2016: IEEE QCMan TPC Co-Chair: Forth International Workshop on Quality of Experience Centric Management (co-located with ITC 28)
2015: SDNFlex Initiatitor + TPC Chair: Workshop on Software-Defined Networking and Network Function Virtualization for Flexible Network Management (SDNFlex) [co-located with Netsys 2015]

Technical Program Committee Member

2018: CoNEXT 2018
2018: CoNEXT Student Workshop 2018
2018: PAM 2018 Passive and Active Measurement Conference
2018: IEEE NetSoft IEEE Conference on Network Softwarization
2018: IEEE GI 21st IEEE Global Internet Symposium
2018: CloudCom 2018
2018: IEEE QoMEX 10th International Conference on Quality of Multimedia Experience
2018: QoE-Management workshop
2018: Internet-QoE co-located with IEEE ICDCS
2018: MobiArch: ACM MobiSys Workshop on Mobility in the Evolving Internet Architecture
2018: ACM SIGCOMM SecSoN ACM SIGCOMM 2018 Workshop on Security in Softwarized Networks
2018: IEEE MIPR IEEE Conference on Multimedia Information Processing and Retrieval
2017: ACM CoNEXT CANCloud-Assisted Networking
2017: ITC29International Teletraffic Congress (ITC-29)
2017: ACM SIGCOMM Internet-QoE workshop
2017: IEEE QoMEX 9th International Conference on Quality of Multimedia Experience
2017: IEEE NFV-SDN IEEE Conference on Network Function Virtualization and Software Defined Networks
2017: CNSM SDN/NFV
2017: IEEE CloudCom
2017: IEEE INFOCOM DCC IEEE INFOCOM Workshop on Distributed Cloud Computing
2017: IEEE NetSoft IEEE Conference on Network Softwarization
2017: NetSys: The International Conference on Networked Systems
2016: IEEE NFV-SDN
2016: IEEE CloudCom premier conference on Cloud Computing
2016: ACM CoNEXT CANCloud-Assisted Networking
2016: MONAMI 8th International Conference on Mobile Networks and Management
2016: ITC: International Teletraffic Congress (ITC-28): Area 4 (Next generation and future Internet architectures)
2016: Man SDN/NFV
2016: PQS: 5th International Workshop on Perceptual Quality of Systems
2016: IEEE ICCE-Berlin: IEEE International Conference on Consumer Electronics
2016: IEEE NetSoft: IEEE Conference on Network Softwarization
2015: SCRUM Strategies for Consistency, Replication, and Understandability in Middleware
2015: IEEE CloudCom premier conference on Cloud Computing
2015: ManSDN/NFV: International Workshop on Management of SDN and NFV Systems
2015: MONAMI 7th International Conference on Mobile Networks and Management
2015: ACM SIGMETRICS DCC ACM SIGMETRICS Workshop on Distributed Cloud Computing
2015: IEEE QCMan IFIP/IEEE Workshop on QoE Centric Management
2014: MONAMI 6th International Conference on Mobile Networks and Management
2013: IEEE WNM Workshop on Internet Measurement
2013: IEEE STEM
2010: ATNAC: The Australasian Telecommunication Network Application Conference 2010, Auckland, New Zealand (Internet Technology Track)
2010: IEEE IWQoS: 18th IEEE International Workshop on Quality of Service 2010, Tsinghua University, Beijing, China
2010: ACM SIGMETRICS (Shadow TPC), Columbia University, New York

Conference Referee

2015: IEEE MASCOTS ACM TVX IEEE QoMEX/
2013: IEEE CyberC, IEEE P2P, IEEE Globecom
2012: EUSIPCO 2012, MMB 2012, EUSIPCO,
2011: IEEE ISCC
2010: NGI, IEEE IPDPS, ITC
2009: Euro-NGI 2009 INFOCOM PAM,
2008: IWQoS, P2P

Journal Referee

2011, 2014, 2015, 2016, 2017: IEEE COMMAG: IEEE Communications Magazine
2012, 2016, 2017: IEEE TNSM: IEEE Transactions on Network and Service Management
2014, 2015, 2016: Springer Mobile Networks and Applications
2010, 2011, 2012: TON: IEEE/ACM Transactions on Networking
2014, 2015: ACM SIGCOMM CCR: ACM SIGCOMM Computer Communication Review
2016, 2017: ACM TOIT ACM Transactions on Internet Technology
2017: ACM TOMM ACM Transactions on Multimedia Computing Communications and Applications
2017: Springer MTAP: Spinger Multimedia Tools and Applications
2017: Elsevier PMC: Elsevier Pervasive and Mobile Computing
2015: IEEE TVT: IEEE Transactions on Vehicular Technology
2014: IEEE COMPUTER
2013: COMCOM: Elsevier Computer Communications
2011: IEEE J-SAC: IEEE Journal on Selected Areas in Communications
2010: AEÜ: International Journal of Electronics and Communications
2010: ToB: IEEE Transactions on Broadcasting
2010: AoT: Annals of Telecommunications
2009: TMM: IEEE Transactions on Multimedia

Editorial Boards

2018: Guest editor: IEEE JSAC Special Issue on SDN Scalability
2017,2018: Guest editor: Elsevier Computer Networks Special issue on Security and Performance of SDN/NFV
2016, 2017: Guest editor: Springer Quality and User Experience journal: Topic Collection on QoE Network Management
2015, 2016, 2017: Editorial board: KuVS newsletter
2015: Guest-editor Wiley Journal of Network Management: Special issue on SDN & NFV (Editorial)

Proposal Reviewer

2009: Euro-NF Joint Research Project proposal

Scribe

2011: IMC 2011: Supporting the IMC TPC meeting held in New Jersey, USA.

Member

ITG 5.2.1: System Architecture and Traffic Engineering interest group

Recent invited talks

2017-11-30: Understanding the Usage of New Internet Protocols in the Wild (Invited talk, Munich Internet Research Retreat Raitenhaslach)
2017-08-21: Quality of Experience Demystified (keynote talk ACM SIGCOMM Internet-QoE)
2017-08-17: How HTTP/2 pushes the web: An empirical study on utilization and QoE perspective on Server Push (International Computer Science Institute, Berkeley, USA)
2016-02-29: Kernel Accelerated Packet Processing (Invited talk, 1st ITN CleanSky Conference Heidelberg)
2015-09-24: Measuring and Optimizing the Cloud (Invited talk, ITG 5.2.1 Cloud Workshop, University of Tuebingen)
2015-09-16: Invited workshop: Scientific Writing (ITN CleanSky Summer School 2015, University of Goettingen)
2015-08-20: An Internet Census Taken by an Illegal Botnet (Invited talk, Academic Centre of Excellence for Cyber Security Research at University College London)
2015-04-15: Software Defined Networking & Network Functions Virtualization (invited talk 12. Sitzung des ITG-Fachausschusses 3.3 Übertragungstechnologien für elektronische Medien)
2015-04-14: On the origins of spam (Invited seminar talk, Project Leonardo RWTH Aachen)
2014-11-14: On the Origins of Spam (RWTH Science Night)

Other

2017-08-21: Panelist User-centric Networking - Beyond QoE and Engagement, ACM SIGCOMM Internet-QoE 2017 (Los Angeles, USA)

Teaching

RWTH Aachen University: As Lecturer (Lehrbeauftragter):

Lecture: Internet Architecture and Performance
Summer 2017 [Video Recordings]
Summer 2018

RWTH Aachen University:

Lecture: Computer Systems Engineering (Co-Lecturer)
Summer 2015 Winter 2016/2017
Lecture: Research Focus Class: Privacy under Attack (Co-Lecturer)
Summer 2015: details Campus Record
Invited seminar talk:Spam RWTH Leonardo seminar: Das Internet: Globales Kommunikationsmedium und Herrschaftsinstrument
Summer 2015
Lecture: Research Focus Class on Communication Systems: Software Defined Networks (SDN) and Network Functions Virtualization (NFV)
Winter 2014/2015

TU Berlin: As Teaching Assistent

Lecture: Network Protocols and Architectures
Winter 2008 Winter 2009 Winter 2010 Winter 2011 Winter 2012
Advanced Seminar: Network Architectures: Internet Measurement
Winter 2008 Summer 2011 Summer 2013
Advanced Seminar: Network Architectures: Internet Routing
Summer 2009

University of Applied Sciences Darmstadt: As Teaching Assistent

Computer Graphics (lecture + lab course)
Summer 2005

Media Coverage

Press

2018: The Guardian: Child abuse imagery found within bitcoin's blockchain (archive)
2018: The Register: Bitcoin's blockchain: Potentially a hazardous waste dump of child abuse, malware, etc (archive)
2018: Sky News: Child abuse images hidden in Bitcoin blockchain (archive)
2018: PCMag: Bitcoin's Blockchain Caught Loaded with Child Pornography (archive)
2018: The Outline: If you downloaded the Bitcoin blockchain, you may have downloaded child porn: A new paper reveals some troubling implications for the blockchain when no one oversees what’s on it. (archive)
2018: engadget.de: Das Problem der Blockchain mit illegalen Inhalten (archive)
2018: Hacker News: Illegal content embedded in the blockchain (archive)
2018: The Register: Google's 'QUIC' TCP alternative slow to excite anyone outside Google (archive)
2015: Unicum: Spam-Mails: Ein Informatiker auf der Jagd nach der dubiosen Netzbranche
2015: Aachener Nachrichten: Wer versendet eigentlich die Spammails?
2014: FAZ: Im Netz der bösen Jungs
2014: business impact (Issue 4/2014): Mail Flut
2014: Slashdot: Researchers Outline Spammers' Business Ecosystem
2014: The Register: Boffins pen 'Guide to better spamming'
2014: Net Security: Relations between spam landscape actors can be leveraged for detection
2014: WinFuture: Forscher dringen in Welt der Spammer ein und finden Kundentreue
2014: Threat post: A Spam Trinity: Email Harvesters, Botmasters, Spammers
2014: Slashdot: Internet Census 2012 Data Examined: Authentic, But Chaotic and Unethical

Radio

2014: Deutschlandfunk Computer und Kommunikation: Spam im Blick

Oliver Hohlfeld

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