Personal profile
Research interests
- Information geometry. A family of probability distributions can be viewed as a submanifold of the space of all probability distributions. The Fisher information metric gives this the structure of a Riemannian manifold. One can then apply geometric notions such as projection, connections and curvature to diverse problems in probability, statistics and optimization.
- Pensions. Applying stochastic modelling techniques to pensions investments. For example, using such techniques to investigate the UK governments auto enrolment policy.
- Twistor Geometry. Twistor geometry relates the conformal geometry of 4 manifolds to the complex geometry of complex 3 manifolds. What happens to the objects of classical geometry in CP3 when they are viewed through the lens of conformal geometry?
Biographical details
John is a lecturer in financial mathematics, probability in statistics.
John has extensive industry experience in financial computing. He co-founded Yolus, developed their industry leading risk management system and was an Executive Director in Operations Technology at Goldman Sachs.
Before working in finance John was a lecturer at Trinity College Oxford. He completed a doctorate in differential geometry at Wadham College, Oxford under the supervision of Simon Salamon following an BA in mathematics, also at Wadham.
Research interests (short)
Information geometry, stochastic filtering, pensions, twistor geometry.
Expertise related to UN Sustainable Development Goals
In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This person’s work contributes towards the following SDG(s):
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SDG 1 No Poverty
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SDG 4 Quality Education
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SDG 5 Gender Equality
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SDG 10 Reduced Inequalities
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SDG 12 Responsible Consumption and Production
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Collaborations and top research areas from the last five years
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Deep Gamma Hedging
Armstrong, J. & Tatlow, G., 4 May 2026, (Accepted/In press) In: The Journal of FinTech.Research output: Contribution to journal › Article › peer-review
Open AccessFile94 Downloads (Pure) -
Gamma Hedging without Rough Paths
Armstrong, J. & Das, P., 13 Jan 2026.Research output: Working paper/Preprint › Preprint
File27 Downloads (Pure) -
Intergenerational cross-subsidies in UK Collective Defined Contribution funds
Armstrong, J., Dalby, J. & Catherine, D., 15 Feb 2026, (Accepted/In press) In: Annals of Actuarial Science.Research output: Contribution to journal › Article › peer-review
Open AccessFile22 Downloads (Pure) -
Abundant Superintegrable Systems and Hessian Structures
Armstrong, J. & Vollmer, A., Aug 2025, In: JOURNAL OF GEOMETRY AND PHYSICS. 214, 105503.Research output: Contribution to journal › Article › peer-review
Open AccessFile2 Citations (Scopus)63 Downloads (Pure) -
Gamma Hedging and Rough Paths
Armstrong, J. & Ionescu, A., 11 Feb 2025, (Accepted/In press) In: Finance and Stochastics.Research output: Contribution to journal › Article › peer-review
Open AccessFile185 Downloads (Pure)
Projects
- 2 Finished
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Collective pensions with investment choice: making CDC work for the UK
Armstrong, J. (Primary Investigator)
2/10/2023 → 1/12/2025
Project: Research
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Financial Mathematics of UK Pensions
Pennanen, T. (Primary Investigator) & Armstrong, J. (Co-Investigator)
1/01/2016 → 31/12/2018
Project: Research
Activities
- 1 Publication peer-review
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International Journal of Theoretical and Applied Finance (Journal)
Armstrong, J. (Peer reviewer)
2013Activity: Publication peer-review and editorial work › Publication peer-review