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USD 80 /hr

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Hire Dr. Haris B.

Greece

USD 80 /hr

Optimization & Geospatial Analysis Expert | Mobility, Simulation & Spatial Intelligence for Real-World Impact

Profile Summary

I'm a data science and optimization expert with deep experience in mobility modeling, spatial analytics, and operational research. My work focuses on transforming complex spatiotemporal data into actionable insights and automated decision systems, especially for urban transportation and mobility, and people flow dynamics. As Head of Modelling & Analytics at a fast-moving startup, I lead the development of AI-powered optimization solutions using real-time data from IoT sensors. I’ve built end-to-end systems that combine routing algorithms, resource allocation models, and simulation engines — deployed via secure APIs and cloud-native infrastructure.

Subject Matter Expertise

• ★ Transportation
• ★ Mathematical Optimization
• ★ Python
• ☆ Civil Engineering
• ☆ Applied Mathematics
• ☆ Software Development

Services

• Research
• Consulting
• Data & AI
• Product Development

Research Scientific and Technical Research

Consulting Scientific and Technical Consulting

Data & AI Statistical Analysis, Algorithm Design-ML, Data Visualization, Big Data Analytics, Data Processing, Data Insights

Product Development Formulation, Prototyping

Work Experience

Founder

transopt

September 2021 - Present

Modelling & Analytics Expert

OpenSpace

February 2021 - Present

Post Doc. Researcher

University of Cyprus

January 2019 - September 2021

Technologist / Transport Modeller

Transport Systems Catapult

May 2017 - January 2020

Graduate Transport Modeller

AECOM Saint Albans

October 2015 - May 2017

Education

PhD Candidate (Civil and Environmental Engineering)

Panepistemio Kyprou

January 2016 - January 2020

MSc in Transport and Business Management (Department of Civil and Environmental Engineering)

Imperial College London

September 2014 - September 2015

(Civil Engineering)

National Technical University of Athens

2007 - 2012

Certifications

• Certification details not provided.

Publications

BOOK CHAPTER

Ballis, H., Loli, M., Antoniou, M., Kourkoulis, R.(2025). HARMA: A Decision-Support Tool for Enhancing Road Transport Infrastructure Resilience Against Natural Hazards . Lecture Notes in Intelligent Transportation and Infrastructure. Part F154. p. 219-231.

JOURNAL ARTICLE

Ballis, H., Dimitriou, L.(2021). Adaptive sampling simulated annealing for the synthesis of disaggregate mobility data from origin–destination matrices . Transportation Research Record. 2675. (7). p. 526-539.

Ballis, H., Dimitriou, L.(2021). Exploitation of Aggregate Mobility Sensing Data for the Synthesis of Disaggregate Multimodal Tours in Megacities . Frontiers in Future Transportation. 2.

Ballis, H., Dimitriou, L.(2020). Deriving Daily Activity Schedules from Dynamic, Purpose-Dependent Origin–Destination Matrices . Transportation Research Record. 2674. (10). p. 375-386.

Ballis, H., Dimitriou, L.(2020). Evaluation of Reinforcement Learning Traffic Signalling Strategies for Alternative Objectives: Implementation in the Network of Nicosia, Cyprus . Transport and Telecommunication. 21. (4). p. 295-302.

Ballis, H., Dimitriou, L.(2020). Optimal synthesis of tours from multi-period origin-destination matrices using elements from graph theory and integer programming . European Journal of Transport and Infrastructure Research. 20. (4). p. 1-21.

Ballis, H., Dimitriou, L.(2020). Revealing personal activities schedules from synthesizing multi-period origin-destination matrices . Transportation Research Part B Methodological. 139. p. 224-258.

Segui-Gasco, P., Parisi, V., Kelsall, D.G., North, R.J., Busquets, D., Ballis, H., Segui-Gasco, P., Parisi, V., Kelsall, D.G., North, R.J., et al.(2019). Simulating a rich ride-share mobility service using agent-based models . Transportation. 46. (6). p. 2041-2062.

CONFERENCE PAPER

Ballis, H., Dimitriou, L.(2021). Evaluating the Performance of Reinforcement Learning Signalling Strategies for Sustainable Urban Road Networks . Advances in Intelligent Systems and Computing. 1278. p. 97-105.

Ballis, H., Dimitriou, L.(2021). Evaluation of Reinforcement Learning Signalling Strategies on the large-scale network of Nicosia . Transportation Research Procedia. 52. p. 373-379.

Ballis, H., Alogdianakis, F., Nikolaou, P., Dimitriou, L., Stylianou, K.(2021). Fusion of General Transit Feed Specification (GTFS) and passenger count data: Α case study on Cyprus transit system . 2021 7th International Conference on Models and Technologies for Intelligent Transportation Systems Mt ITS 2021.