Co-founder and CTO at Dashbase

Dashbase makes sense out of VoIP data + app logs for teams delivering voice, video, & chatDashbase is for quickly and proactively serving customers of unified communications, powered by VoIP & telemetry data


Dashbase, Inc.

StreamNative

PingCAP

Helping Imply to make Druid (http://www.druid.io) more awesome!


Imply

Worked on the next generation search infrastructure at Twitter.Key accomplishments:● User Search - Added realtime features, while reducing 99.9% latency from 1500ms down to 27ms. Reduced cluster size while sustaining corpus growth of over 200%. This was done in midst of a decision to double the cluster to handle increasing traffic, and resulted instead in halving the cluster size and still with 7x head room for traffic spikes.● Social Filtering - Per query social filtering with early termination for user index. This greatly reduced cost while maintaining social relevance on the user index.● Social Index - Incorporated the Twitter follow graph into the user index for supporting complex social queries, making filtering on large following lists possible. This removes the need for a separate social/follow graph cluster. This is similar to Facebook's Unicorn paper.● Field attribution for relevance scoring - Enhanced Lucene's relevance model that provides attribution information from different parts of the query tree. This is necessary for layered reranking support.● Realtime indexing core - Launched version 2 of the realtime indexing core that powers both tweet user indexes. This posting format removes the limitation that the previous posting encoding can have at most 255 positions. This technology was generalized into a memory codec for a generic Lucene application to handle in-memory indexing for realtime data.● Search Root - Generic scatter-gather framework for parallelize work on homogeneous partitions of data in a distributed setting. This is used across different cluster types of Twitter's search corpuses.
    
        …
      
        see more
      
    



About us

  Twitter is a global platform for public self-expression and conversation in real time. By developing a fundamentally new way for people to consume, create, distribute and discover content, Twitter enables any voice to echo around the world instantly and unfiltered. The service can be accessed at Twitter.com, on a variety of mobile devices, and via SMS. Available in more than 35 languages, Twitter has 316 million monthly active users. For more information, visit about.twitter.com or follow @twitter. 

U.S. offices
Atlanta, Boston, Boulder, Chicago, Cincinnati, Detroit, Los Angeles, Miami, New York, San Francisco (Headquarters), Seattle, Sunnyvale, Washington. D.C.

International offices
Amsterdam, Bangalore, Berlin, Bogota, Brussels, Cologne, Dubai, Dublin, Hamburg, Hong Kong, Jakarta, London, Madrid, Melbourne, Mexico City, Milan, Mumbai, New Delhi, Osaka, Paris, Rio de Janeiro, São Paulo, Singapore, Sydney, Seoul, Tokyo, Toronto, Vancouver


      Twitter
  

Responsible for technology powering search and content products at LinkedIn including the LinkedIn Homepage and Search pages.● Responsible for update stream data infrastructure providing personalized and relevant activity streams on the LinkedIn Homepage. The system is high performance and highly scalable.● Creator and project lead for SenseiDB:http://senseidb.comhttp://engineering.linkedin.com/open-source/introducing-senseidb-10-open-source-distributed-realtime-semi-structured-databasehttp://blog.sematext.com/2012/01/26/sensei-distributed-realtime-semi-structured-database/● Co-Creator of LinkedIn Signal:http://www.linkedin.com/signal● Architected and led development of LinkedIn Faceted Search: http://blog.linkedin.com/2009/12/14/linkedin-faceted-search/● Created Zoie, a high performance realtime indexing and search system that serves as the foundation for different aspects of LinkedIn search functionality. This system was generously donated by LinkedIn to the open source community:http://javasoze.github.com/zoie● Led an amazing team and built a distributed search system to allow LinkedIn's social network based people search to scale horizontally. This project marks the beginning of LinkedIn's next-generation search capabilities.● Worked with a couple of super-smart talented engineers on Kamikaze, a compression library for search systemshttp://javasoze.github.com/kamikaze● Frequent winner of the LinkedIn Hackday
    
        …
      
        see more
      
    



With 20 million jobs on LinkedIn, find one meant for you. #InItTogether

Founded in 2003, LinkedIn connects the world's professionals to make them more productive and successful. With more than 660+ million members worldwide, including executives from every Fortune 500 company, LinkedIn is the world's largest professional network. The company has a diversified business model with revenue coming from Talent Solutions, Marketing Solutions, and Premium Subscriptions products. Headquartered in Silicon Valley, LinkedIn has offices across the globe.


      LinkedIn
  

Gave a guest lecture to the University of Utah's school of management on search technology and innovation.


The University of Utah is the state’s oldest and largest institution of higher education and is a major research university. The U offers over 100 undergraduate and more than 90 graduate degree programs to over 28,000 students.

The University of Utah is one of the state’s largest employers and is ranked as one of the top public research universities in the nation.  In 2002 the University of Utah hosted the Olympic Village as well as Winter Olympic events, including the opening and closing ceremonies.


      University of Utah Entrepreneur Club
  

Contributed a chapter to Lucene In Action (2nd Edition)on search technology behind LinkedIn.com:http://www.manning.com/lucene/


About us

  We publish computer books for professionals--programmers, system administrators, designers, architects, managers and others. 

We think of our authors as the most valuable part of our business. We respect our readers and consider their interests and preferences every working day. Manning is a small, personal, old-world publisher where an author's opinion is sought and a reader's message is answered.

Manning's focus is on computing titles at professional levels. We care about the quality of our books. We work with our authors to coax out of them the best writing they can produce. We consult with technical experts on book proposals and manuscripts, and we may use as many as two dozen reviewers in various stages of preparing a manuscript. The abilities of each author are nurtured to encourage him or her to write a first-rate book. 

Our books are designed without gimmicks. Their main goal is elegance and readability--we feel the two are often the same. Many of our books come with online reader support: authors answer the questions of their readers in our Web-based Author Online discussion forums.


      Manning Publications Co.
        
  

http://www.plum.com/Had a great deal of fun building social search solutions on a J2ee platform.Built the search and browse system.Built the API and RPC platform.Built the event system.Took owner ship of developing and architecting the back-end of plum.com.
    
        …
      
        see more
      
    



About us

  Plum Super provides integrated and innovative superannuation and pension solutions to current and former employees of medium and large Australian organisations. 
Plum Super is part of the MLC Super Fund, one of Australia’s largest super funds. The MLC group of companies is the wealth management division of National Australia Bank (NAB). With offices in Melbourne and Sydney, and representatives around the country, Plum currently administers around $27 billion in super on behalf of 100 + employers and more than 200,000 members. 
We offer a range of investments choice, including pre-mixed, diversified, and sector-specific options, and assets managed by JANA – one of Australia’s largest and most respected investment consultants. We strive to become the trusted superannuation adviser to employers and to work together to educate and empower their employees to take control of their financial future.

Plum

Built the job search system from the ground up. Developed features such as job browse, job recency boost etc. Also built a benchmark suite for performance tuning.The system is built on Apache Lucene.


Simply Hired

Designed and built the social search solution for MyWeb 2.0: http://myweb2.search.yahoo.com.MyWeb is a social search service from Yahoo! that allows users to share bookmarks. While working on this project, I solved interesting problems relating to duplicate removal, social network access control, scalability etc. and resulted in patents.
    
        …
      
        see more
      
    



Yahoo dials up what people love most with apps and sites like Yahoo Sports, Yahoo Finance, Yahoo Fantasy, Yahoo Mail and more in the works everyday. We reach millions of people around the globe and connect advertisers with just the right audiences to help build their brands and businesses. Yahoo is headquartered in Sunnyvale, California, and has offices located throughout the Americas, Asia Pacific (APAC) and the Europe, Middle East and Africa (EMEA) regions. Find more Yahoo jobs, B2B info and press updates at verizonmedia.com.

For sales opportunities visit: https://www.verizonmedia.com/advertising/contact-us

To work with us, visit: https://www.linkedin.com/company/verizon-media/


      Yahoo
  

Led a team of 3 engineers and developed the kernel of Entopia's search technology - K-Engine. This is a scalable distributed search solution that indexes social network, full-text and semantic contents that scales to millions of documents. It is written in Java and deployed under the J2EE platform. The full text search aspect of the architecture is built on Apache Lucene.
    
        …
      
        see more
      
    



About us

  Entopia, Penang Butterfly Farm reinvented

“Lessons from nature have to be free from the confines of the classroom to be meaningful. That’s why I dreamed of an idyllic garden to share my passion.” – Mr David Goh, founder & insect enthusiast

Who would have thought that a tropical eco-system prototype for Clive Farrell’s greenhouse at Stratford-on-Avon, UK in the 1980’s would start an emerging trend in live butterfly exhibitions around the world? Little did we know that a simple hobby in the Goh’s backyard would eventually evolve into a thriving butterfly-breeding business and the place to be in Penang.

Since opening our doors to the public in March 1986, Penang Butterfly Farm – the first tropical butterfly exhibition in the world – has played host to over 4 million visitors. Inspired by our conversations with visitors and academia near and far, we have built on our rich heritage to create the ultimate “Nature Learning Destination”.

It is this same desire to help people live in better harmony with nature that led to our rebirth as ENTOPIA. Imagine nature’s largest classroom and discovery hub, where the butterflies and insects are free to come out to play. This is our very own Entomological Utopia.

Entopia

Co-created the Verity Parametric Search/Relational Taxonomy technology. This technology allows for real-time intersection of various types of result sets, e.g. full text, SQL-like selections and taxonomy browse sets. It powers applications to create various selections and taxonomies in order to make data catalogs truly browsable. Prototyped and productized this technology (which was a significant revenue generator for Verity). Led a team of 3 engineers and architected the Verity Federated Infrastructure. To provide an extensive framework to perform RPC calls to the backend server, developed and grew this into a platform where all Verity client APIs are built from. The framework is a RMI-flavored RPC model that contains TCP and RDBMS connection pooling, internationalization support and a transaction layer that communicates with a backend C++ server. This lays the foundation for Verity's hybrid Java/.NET to C++ architecture.
    
        …
      
        see more
      
    



HP Autonomy, is a global leader in software that processes human information, or unstructured data, including social media, email, video, audio, text and web pages, etc. Autonomy’s powerful management and analytic tools for structured information together with its ability to extract meaning in real time from all forms of information, regardless of format, is a unique tool for companies seeking to get the most out of their data. Autonomy’s product portfolio helps power companies through enterprise search analytics, business process management and OEM operations. Autonomy also offers information governance solutions in areas such as eDiscovery, content management and compliance, as well as marketing solutions that help companies grow revenue, such as web content management, online marketing optimization and rich media management.

Please visit www.autonomy.com to find out more.

About HP
HP creates new possibilities for technology to have a meaningful impact on people, businesses, governments and society. The world's largest technology company, HP brings together a portfolio that spans printing, personal computing, software, services and IT infrastructure to solve customer problems. More information about HP (NYSE: HPQ) is available at http://www.hp.com.


      HP Autonomy
  

Implemented the billing solution for the game Everquest expansion pack - Ruins of Kunarc on the Portal Software's Infranet product using C++ on Unix.



      Sony Online Entertainment
  

Built ColdFusion and J2EE web applications for the Lockheed Postal Services Division.


About us

  Breakthrough performance.
Game-changing innovations. 
Unwavering sense of purpose. 

Headquartered in Bethesda, Maryland, Lockheed Martin is a global security and aerospace company principally engaged in the research, design, development, manufacture, integration and sustainment of advanced technology systems, products and services.


      Lockheed Martin Space Systems Company
  

Built 3D Graphics (OpenGL) drivers for image generators Harmony and Essemble. These image generators were primiarily used in flight and tank simulations.


About us

  Evans & Sutherland is the world's first computer graphics company and has developed advanced computer graphics technologies for almost four decades. Focusing primarily on digital planetariums and digital cinemas worldwide, E&S offers Digistar, the world's leading digital planetarium system, fulldome programs and production services, giant screen films formatted for fulldome theaters, premium-quality projection domes and theater design services.

Evans & Sutherland

Worked on a Data General mainframe.Wrote programs in CQCS to generate data reports for staff salaries and annual student assessments.


Stanford University is one of the world's leading research universities. Stanford is known for its entrepreneurial character, drawn from the legacy of its founders, Jane and Leland Stanford, and its relationship to Silicon Valley. Research and teaching stress interdisciplinary approaches to problem solving. Areas of excellence range from the humanities to social sciences to engineering and the sciences. Stanford is located in California's Bay Area, one of the most intellectually dynamic and culturally diverse areas of the nation.

Stanford University

Focused in Computer Graphics and Object Oriented Methodology.

The best public university in the Northeast. 

A world-class institution, Binghamton University offers students a broad, interdisciplinary education with an international perspective and one of the most vibrant research programs in the nation.

Ranked among the elite public universities in the country, Binghamton challenges students academically, not financially, in its unique, best-of-both-worlds environment.

Our academic culture rivals a first-rate private university — rigorous, collaborative and boldly innovative — while our campus culture exemplifies the best kind of public university experience: richly diverse students, active social life and deep engagement with the community.

Our students, both undergraduate and graduate, work one-on-one with an exceptional faculty and groundbreaking scholars. They take advantage of special academic opportunities like combined degrees, foreign language study groups and an unparalleled international education program.

Binghamton University

Focused in Differential Equations and Topology.

Graduate work in computer graphics and image synthesis, did not complete degree

The University of Utah, located in Salt Lake City in the foothills of the Wasatch Mountains, is the flagship institution of higher learning in Utah. Founded in 1850, it serves over 31,000 students from across the U.S. and the world. With over 72 major subjects at the undergraduate level and more than 90 major fields of study at the graduate level, including law and medicine, the university prepares students to live and compete in the global workplace. Known for its proximity to seven world-class ski resorts within 40 minutes of campus, the U encourages an active, holistic lifestyle, innovation and collaborative thinking to engage students, faculty and business leaders.

The University of Utah became a member of the PAC-12 conference in July 2011.

Technology and Commercialization
The University of Utah is tops in the country for creating start-up companies from university research, according to a ranking by the Association of University Technology Managers (AUTM). See http://unews.utah.edu/news_releases/u-of-utah-no-1-for-startups for more information.

Forbes magazine’s recent ranking of the “Best States for Business” pointed to “an educated labor force” as a big reason Utah came in at number one. The U supplies many of the employees for companies that keep expanding their operations in Utah, such as Goldman Sachs, Adobe, Omniture, Oracle, Ebay and many others. http://pac12info.utah.edu/commercialization-of-innovation/

Healthcare
University of Utah Health Care recently ranked first in the nation in a prestigious national study. The University Health System Consortium’s 2010 Quality and Accountability Study compared 98 of the nation’s top academic medical centers and ranked them based on core quality measures, patient safety indicators, mortality rates, re-admission rates, and patient satisfaction scores. See more about University of Utah Health Care at http://healthcare.utah.edu/index.php

Co-founder and CTO at Dashbase, Inc.

Co-founder and CTO

Advisor

Investor

Advisor

Advisor

Staff Software Engineer & Tech Lead

Search Architect

Guest Lecturer

Contributing Author

Software Architect - Search

Search Consultant

Technical Yahoo! Sr.

Software Architect

Software Architect

Senior Platform Engineer

Senior Associate Software Engineer

Software Engineer II

Programmer

Computer Science

Graduate work on Database and Information Retrieval

Computer Science

BS

Mathematics

BS

Computer Science

MS