I'm Connor Gramazio.

I research data visualization as a computer science PhD canditate and a National Science Foundation graduate research fellow at Brown University, where I am advised by David Laidlaw. My dissertation committee members are Jeff Huang, Ben Raphael, and Karen Schloss.

My research focuses on human-centered visualization design. Specifically, my thesis expands our understanding of effective design practices and provides new computational techniques to improve visualization stylization and user behavior classification by working in cancer genomics application areas.

I'm currently looking for jobs starting post-academic year.

Before starting at Brown I graduated from Tufts University, where I was advised by Remco Chang and Sara Su.

  • [email protected] [uni] edu
  • @ccgramazio
  • Google Scholar
  • Github


Color, Perception, Design


d3-cam02 is an extension to D3.js to support CIECAM02 perceptual color space, which is a modern successor to CIELAB. Supporting perceptual color spaces is critical given that interpolating in non-perceptual spaces like RGB can create perceptually misleading color shifts.


d3-jnd is an extension to D3.js, which allows programmers to quickly check whether two colors can be easily differentiated. Further, user-defined parameters allow programmers to define how conservative they want color differentiability predictions to be.


Colorgorical is a web-based tool for creating information visualization color palettes. Users design palettes by controlling the relative importance of color preference and discriminablity. Color selection can be further customized with hue and lightness filters, and users can also specify palettes to build upon.

Visualization search

In this work I tested how the layout, number, and physical size of data affects visualization search performance. Our findings show that perceptual grouping greatly affects performance and that performance gains from increased physical size eventually plateau.

Exploring visualization design spaces

In this work I helped code visualizations to construct a phylogenetic classification of the visualization layout design space, helped develop initial prototypes, and helped evaluate the effectiveness of our technique.

Biology Visualization


MAGI is an online cancer genomics visualization tool, which allows researchers to query sets of genes and renders mutation information across five separate views to support a myriad of analytical tasks.


GD3 is cancer genomics visualization library designed to make it easier to make interactive cancer visualizations. Built on top of D3, GD3 simplifies design by allowing users to declaratively style visualizations with JSONs. More complex stylization (e.g., global color configuration and brushing) is handled through simple dispatch configuration

Molli / TuftsViewer

Molli is a protein visualization tool that was built to support comparative structural analysis. In addition to rendering 3D structure, Molli also shows aligned sequences and residue information for each of the displayed proteins


Crowdsourcing methodology

In this study I helped test and categorize novice crowdsourcing requester strategies while also collecting faculty information about the top 50 computer science departments in the USA.


Heapviz is a visualization tool to explore snapshots of the Java heap captured during runtime. I helped create the visualization interface, which shows simplified Java heap information so that otherwise sprawling Java heaps are simplified so that data structures are recognizable.

About me

I’m currently a computer science PhD candidate and National Science Foundation graduate research fellow at Brown University.

While my research foundation is in visualization, my work is a product of multidisciplinary collaboration. As such, I have gained experience or familiarity in visual perception, human-computer interaction and information retrieval, and computational cancer genomics. In particular, my research has greatly benefited from the experimental design, statistical analysis, and machine learning skills I have gained through these collaborations.

Before Brown, I graduated from Tufts with a B.S. in computer science. I also minored in religion and drummed, danced, and sang in Kiniwe – Tufts’ Ghanaian performance ensemble – for four years, which was then directed by Professors Nani Agbeli (now at CalArt) and David Locke.

In college I got hooked on learning about and experiencing other cultures. Since then, I've been lucky enough to be able to visit and explore several countries first-hand. My favorite way to travel is with nothing more than a carry-on backpack, and I love hiking and backpacking whenever possible.