Daniel Crichton is a program manager and principal computer scientist at the Jet Propulsion Laboratory where he
manages the Planetary Data System Engineering office. He is also the Principal Investigator for Informatics for the
Early Detection Research Network (EDRN), a biomedical research network of over 40 institutions performing
research in the discovery of cancer biomarkers. He chairs international working groups on Information System
Architecture in space and planetary science including the Information Architecture Working Group for the
Consultative Committee on Space Data Systems (CCSDS). He has also served as the Principal Investigator for the
Object Oriented Data Technology task which was selected as Runner-Up for NASA Software of the Year in 2003
and managed the startup of JPL's Enterprise Architecture project. He has worked on numerous data system projects
for science, engineering and institutional projects and has authored several papers including two book chapters on
science information system architectures. He holds both a M.S. and B.S. in Computer Science.
Jeff Estefan is the Division Chief Technologist for the Systems and Software Division at NASA's Jet Propulsion
Laboratory in Pasadena, California where he is responsible for overseeing the technology development and infusion
efforts performed by the Division. Jeff is the primary JPL representative to the Organization for the Advancement
of Structured Information Standards (OASIS) and voting member of the Reference Model for SOA Technical
Committee and Reference Architecture for SOA Subcommittee. He helped develop the Reference Model for SOA
v1.0, an OASIS Standard, and is currently working on development of the OASIS Reference Architecture for SOA
specification. Jeff has worked for a number of organizations in various technical and leadership capacities including
GN&C systems engineering at The Boeing Company in Seattle, planetary navigation system engineering at JPL,
worldwide solution architecting for the IBM Software Group, and, more recently, technology portfolio management
and Enterprise Architecture at JPL. Jeff earned his M.S. in Applied Mathematics from the University of
Washington, his B.S. in Mathematics from Washington State University, and served as an Aeronautical Engineering
Duty Officer for the U.S. Naval Air Reserve from 1988 to 1998. He received an honorable discharge from military
service with the grade of Lieutenant Commander.
Steven Fonseca currently serves as Chief Software Architect for the Deep Space Information Services Architecture
where he is chartered with the development of a service-oriented architecture for Jet Propulsion Laboratory’s (JPL)
Deep Space Network and Advanced Multi-Mission Operations System. Previously he spent three years working at
NASA Ames Research Center beginning with a post doctorate study looking at peer-to-peer based infrastructures
offering expressive publication and subscription languages. Steven then joined the Mission Control Technologies
Project where he served as Architect and Engineering Lead for a set of frameworks to build ground systems from
semantically interoperable composed components. Steven researched the engineering of ontology-based
applications while sub-group lead for NASA’s C3I Information Architecture Team. Steven completed his PhD in
Computer Science from UC Santa Cruz for work on “Methodological and Software Artifacts Support for Agent-
Oriented Component Reuse and Engineering” in collaboration with and funding from Hewlett Packard Laboratories.
Before completing an MS in Computer Science from UC Santa Cruz, he completed a BS in Computer Engineering
from UC Davis. At that time Steven was interested in computer architecture and digital circuit design. He spent
time working in a digital signal processing lab and held several short term positions at Intel.
Mr. Adans Y. Ko is the Software Systems Engineer at JPL. He is responsible for the Ground Data System Software
Architecture for Advanced Multi-Mission Operation System (AMMOS), which includes mission planning, mission
design, sequencing, mission downlink, and instrument science operations for current and future NASA missions and
the Deep Space Network. He received NASA's Exceptional Service Medal for his work on Voyager's onboard
Computer Command Subsystem for mission to Uranus and Neptune. He was the Development Manager of the
Mission Planning and Sequence Subsystem. He got his B.S.C.S. degree from the Utah State University, Logan,
Utah. In 1982, his M.B.A. degree from University of California, Los Angeles in 1993.
Costin Radulescu is a senior member of the technical staff of Instrument Software and Science Data Systems at the
Jet Propulsion Laboratory in Pasadena, California. His background includes design and implementation of various
real-time telemetry and ground data systems ranging from embedded onboard applications to multi-mission data
management systems. Currently his work focuses on the infusion of different registry standards and technologies
within a Service-Oriented-Architecture. Costin is very much in touch with the industry, and he is a recipient of the
American Council of Engineering (ACEC) Award for real-time data systems innovation and design.
Costin earned his B.S. in Computer Science from California State Polytechnic University, Pomona.
Jeff Singer is the Lead Development Engineer for the Messaging Services Products and Telecommand Common
Software tasks at the Jet Propulsion Laboratory in Pasadena, California. Jeff is also a member of the Command
Control subsystem team, performing in the role of software engineer. Jeff has worked for a number of organizations
in technical lead positions including TMINUS10 and PLEX Systems. Jeff has also spent time in the finance
industry, serving as a precious metals trader for Imperial Bank, including participation in development of trade
systems. Jeff earned his M.S. in Computer Science from California State University Fullerton and his B.S. in
History and Philosophy from Claremont McKenna College.