Christos Kallidonis

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Welcome!

I'm Christos Kallidonis

Scientific Software Engineer ◆ Physicist

  • What I do Linking Programming, Science and Technology to improve and save the lives of cancer patients
  • Affiliation Accuray, Inc.
  • Contact I like meeting people! Use the contact form at the bottom of the page to connect!

Hello and welcome! I’m Christos, a passionate Computational Scientist with a strong background in Scientific Software Development, High-Performance Computing and Theoretical and Computational Physics. In a typical day I research, develop and program sophisticated methodologies with direct applications in Medical Imaging. I apply my extensive experience in GPU and High-Performance computing, gained from many years of academic research, to ensure that the methods I implement run efficiently on state-of-the-art Radiotherapy medical devices for the treatment of various types of cancer.

When I’m not coding, I enjoy singing and playing the guitar and piano. Some of my interests are reading, cooking, digital photography, traveling and aviation. Scroll down to learn more about me and my work!

Work Experience

Jul. 2021 - Current

Senior Scientific Software Engineer, Accuray, Inc.

Develop original programming code using C++ and CUDA to implement cutting-edge scientific medical imaging methods on high-performance computing platforms featuring NVIDIA GPUs, and ensure that these run reliably, safely and efficiently on the company's medical device products.

Sep. 2020 - Jul. 2021

Postdoctoral Fellow, Jefferson Lab

Design revolutionary methodologies to carry out computationally intensive tasks in reduced time. Utilize groundbreaking Machine Learning methods with TensorFlow for large data analysis.

Aug. 2017 - Aug. 2019

Postdoctoral Associate, Stony Brook University

Investigate high-impact properties of fundamental particles. Perform data analysis using Python and CUDA.

Aug. 2019 - Aug. 2020

Postdoctoral Research Associate, William & Mary

Top-notch scientific research in Lattice QCD. Manage and analyze terabyte-scale data sets for the extraction of scientific quantities.

Feb. 2014 - Jun. 2017

Research Assistant / PhD Candidate, The Cyprus Institute

PhD studies. Focus on developing original methods, high-performance-computing and the efficient utilization of CPUs and GPUs for Lattice QCD applications, to make first-time computations of key scientific observables feasible.

Education

2017

Doctor of Philosophy in Computational Sciences

The Cyprus Institute

2013

Master of Science in Physics

University of Cyprus

2011

Bachelor of Science in Physics

University of Cyprus

Core Skills and Competencies

C and C++ Programming
Exceptional critical and analytical thinking skills
CUDA / GPU Programming
Excellent ability in problem detection and resolution
Python
Software Development
Theoretical/Computational Physics
Data analysis / mining / presentation
Oracle SQL
Bash Shell scripting
Outstanding capability in parsing information and decision-making
Highly proficient in UNIX/Linux and Supercomputer environments
High-Performance Parallel Computing
Version Control Systems (Git, Perforce)
Probability and Statistics
Excellent communication skills
Numerical iterative Methods
Monte Carlo Simulations

Portfolio

DIS2021 Conference (Virtual)

Conference Outreach Talk

Jefferson Lab Seminar

Conference Outreach Talk

Lattice Workshop at Brookhaven National Laboratory

Conference Outreach Talk

Seminar Talk at The Cyprus Institute

Outreach Talk

GPU Hackathon, Brookhaven National Lab

Outreach Talk

36th International Symposium on Lattice Gauge Theory (Lattice2018)

Conference Talk

Stony Brook University Seminar

Outreach Talk

Early Career Research Symposium 2017

Conference Talk

The Cyprus Institute Seminar series

Outreach Talk

Strange and charmed particles

Outreach Poster

Outreach Poster

Venue
The Cyprus Institute
Event
Poster Exhibition

The poster that I created for the Lattice QCD group of The Cyprus Institute. For the full size poster click here.

Electromagnetic Interactions with Nucleons and Nuclei 2015

Conference Talk

Conference Talk

Event
Electromagnetic Interactions with Nucleons and Nuclei 2015 (EINN2015)
Venue
Annabelle Hotel, Paphos, Cyprus
Date
November 3 - November 5, 2015

Title  page of the talk that I gave at the Electromagnetic Interactions with Nucleons and Nuclei 2015 (EINN2015) conference, held in Paphos, Cyprus. For more details and full talk, click here.

 

Global risk of dispersion of radionuclides from potential nuclear accidents

Outreach Visualisation

Global risk of dispersion of radionuclides from potential nuclear accidents

Outreach Visualisation

This is the video that I created for the purposes of the course “Data Structures” that I attended as part of my PhD studies at the Computational Sciences PhD program of The Cyprus Institute. For more information, click here.

2015 IEEE SciVis Contest Cosmological Data Visualisation

Outreach Visualisation

Visualising the Universe

Outreach Visualisation

Video created and published for the Visualisation Lab of The Cyprus Institute. This video shows how particles merge into halos from various perspectives, including a short navigation into the particle cloud. For more information click here.

Particles Acceleration

Outreach Visualisation

Visualisation of the Acceleration of the particles, using the data of the Dark Sky Simulations. This picture was created using the Paraview Visualisation software. Areas in red demonstrate high values of the acceleration. We note that, as the particles form clusters, the acceleration drops due to the smaller rate of change of the gravitational potential. For more information click here.

Particles Gravitational Potential

Outreach Visualisation

Visualisation of the Gravitational Potential of the particles, using the data of the Dark Sky Simulations. This picture was created using the Paraview Visualisation software. Brighter areas show stronger gravitational potential. We note that as the particles cluster and move closer to each other, the gravitational attraction between them becomes larger. For more information click here.

Particles Velocity

Outreach Visualisation

Visualisation of the Velocity of the particles, using the data of the Dark Sky Simulations. This picture was created using the Paraview Visualisation software. Blue areas show high velocities, while yellow indicates smaller values. We note here that at early times there are high values of the velocities, while as the particles form halos the velocity drops significantly in the areas of smaller or no presence of halos. For more information click here.

Methods on Lattice Gauge Theory 2015, Germany

Conference Talk

Conference Talk

Event
Methods on Lattice Gauge Theory
Venue
University of Bonn, Germany
Date
March 23rd – April 2nd, 2015

Title page of the talk that I gave at the Methods on Lattice Gauge Theory 2015 Conference, held in Bonn, Germany. For more details and full talk, click here.

 

32nd International Symposium on Lattice Gauge Theory (Lattice2014)

Conference Talk

Conference Talk

Event
The 32nd International Symposium on Lattice Gauge Theory
Venue
Columbia University, New York City, NY, USA
Date
June 23 - June 28, 2014

Title page of the talk that I presented at the 32nd International Symposium on Lattice Gauge Theory (Lattice2014), held in New York City, U.S.A. For more details and full talk, click here.

My Work in numbers

16

Publications

in Scientific Journals

21

Proceedings

in Conferences

15

Talks and Seminars

worldwide

1400

+ Citations

in Google Scholar

Latest Publications

Title (click for PDF) Journal Year
Valence parton distribution of the pion from lattice QCD: Approaching the continuum limit Physical Review D 102 2020
Valence parton distribution function of pion from fine lattice Physical Review D 100 2019
Strange nucleon electromagnetic form factors from lattice QCD Physical Review D 97 2018
View all publications

 

Awards

803aExcellence in research and academic performance, MSc program.
Gold cup winner trophyWinner of poster competition, CSC2013 conference.
piano-ribbonValedictorian of St. Marcus High-School, class 2005. GPA: 3.97/4.00.

My Interests

When I’m not in front of my computer screen doing Physics and Programming, I find myself reading, or singing and recording songs with my guitar. I also enjoy taking pictures with my digital camera. Check out some of my pictures in my flickr and instagram accounts! I admittedly love travelling, and always like to express my fascination in the aviation industry and my endless love for aircraft. I can’t resist to mediterranean cuisine, a fresh cup of coffee and a hot cup of tea.

  • Music
  • Digital photography
  • Travelling / Aviation
  • Reading
  • Coffee
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Contact

Feel free to contact me!

  • Address Accuray, Inc., Imaging Technologies. Solon, Ohio 44139, USA.
Christos Kallidonis © Copyright 2022. All rights reserved.