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Joey O'Brien

Principal Consultant

LSEG

I am a Principal Consultant in the Quant Services division of LSEG, where I partner with tier-one investment banks, hedge funds, and risk technology teams to design, validate, and implement quantitative models for counterparty credit risk and derivative pricing. My work spans CVA, DVA, FVA, and PFE model validation, regulatory compliance with frameworks such as SS1/23 and FRTB, and the deployment of open-source risk infrastructure using the Open Source Risk Engine (ORE).

I hold a PhD in Applied Mathematics from the University of Limerick, where my research focused on describing the dynamics of complex systems (such as online social networks and popularity dynamics) using mathematical modelling and large-scale data analysis. This background in applied statistics and network science now informs my approach to building robust, mathematically rigorous financial risk analytics.

My technical toolkit includes Python (NumPy, SciPy, pandas, QuantLib Python), C++ for performance-critical pricing components, and R for statistical analysis and diagnostics. I also regularly contribute to LSEG’s Ahead of the Curve podcast series, discussing ORE developments, model risk regulation, and the future of quantitative risk management.

Interests

  • Counterparty Credit Risk (CCR)
  • XVA (CVA / DVA / FVA)
  • Derivative Pricing & Valuation
  • Model Risk Management
  • Quantitative Finance

Education

  • PhD in Applied Mathematics, 2017-2021

    University of Limerick

  • BSc. in Financial Mathematics, 2013-2017

    University of Limerick

Expertise

Quantitative Risk & Model Validation

I specialise in the validation and implementation of quantitative models across the trade lifecycle, with particular depth in:

  • XVA Modelling: CVA, DVA, FVA, MVA, and KVA frameworks; sensitivities and Greeks; regulatory capital
  • Counterparty Credit Risk: PFE simulation, ISDA SIMM, netting and collateral agreements
  • Derivative Pricing: Interest rate products (swaps, caps, floors, swaptions), credit derivatives, FX derivatives
  • Model Validation: Independent model review, backtesting, stress testing, regulatory documentation
  • Regulatory Compliance: SS1/23 (PRA Model Risk Management), FRTB, Basel IV
  • Open Source Risk Engine (ORE): Configuration, customisation, and validation against bespoke systems

Recent Posts

Articles on Mathematics, Data, & Technology

Featured Post 2026

Sensitivity Analysis in ORE

Run ORE’s native zero-domain interest-rate sensitivities for a single-curve EUR-ESTER OIS, then follow the Jacobian par conversion that maps those deltas onto the liquid OIS quotes a trader can …

Media & Speaking

Podcasts, Keynotes, Industry Labs & Academic Seminars

FEATURED PODCAST LSEG Ahead of the Curve

Agentic AI in Quantitative Risk Management

Discussing the real-world operational transformation and governance challenges of deploying autonomous AI agents and Open Source Risk Engine (ORE) architectures on institutional trading and risk desks.

Key Discussion Topics:
  • Autonomous agents for model validation & stress testing
  • ORE architecture & multi-asset valuation workflows
  • Bank of England PRA SS1/23 supervisory alignment

Recent Summits, Keynotes & Appearances

Jul 2026 PODCAST Online

LSEG Ahead of the Curve Podcast: Agentic AI in Quantitative Risk Management

Joined the latest episode of LSEG’s Ahead of the Curve podcast alongside Xabier Anduaga and Stuart Smith to discuss the real-world impact …

May 2026 PRESENTATION Paternoster Square, London, UK

LSEG’s Internal Adoption of ORE

Presented at the LSEG Quant Summit London 2026, discussing LSEG’s internal adoption, integration, and scaling of the Open-Source Risk Engine …

May 2026 PRESENTATION Paternoster Square, London, UK

ORE in the Era of Agentic AI

Presented at the LSEG Quant Summit London 2026, exploring the capabilities and limitations of Large Language Models (LLMs) in writing …

Nov 2025 PRESENTATION Tokyo, Japan

ORE & Risk Analytics Lab Tokyo

Attended and supported our APAC team’s ORE & Risk Analytics Lab event in Tokyo, which gathered Japanese market participants and risk …

Jan 2025 PODCAST Online

LSEG Ahead of the Curve Podcast: UK Model Risk Regulatory Landscape & SS1/23

Featured on LSEG’s Ahead of the Curve podcast alongside Scott Sobolewski and Xabier Anduaga to discuss the UK model risk regulatory …

Dec 2024 PODCAST Online

LSEG Ahead of the Curve Podcast: 2024 Year in Review

Joined the Ahead of the Curve: 2024 Year in Review podcast episode alongside Scott Sobolewski and Roland Stamm to reflect on key ORE …

News & Updates

  • July 2026Podcast: Featured on LSEG’s Ahead of the Curve podcast discussing the real-world impact and future of Agentic AI in quantitative risk management. Listen & Watch →
  • November 2025Conference & Lab: Attended and supported our APAC team’s ORE & Risk Analytics Lab in Tokyo, presenting to risk professionals from leading financial institutions on CVA frameworks, custom risk models, and capital efficiency.
  • March 2021New Scientist & PLOS ONE: Our mathematical research on Fantasy Premier League published in PLOS ONE and featured in New Scientist: Maths reveals the top strategies to win at fantasy football. Read Paper (PLOS ONE) | arXiv