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Connor KrollsPortfolio

Experience

Machine learning research, engineering, leadership, and teaching.

Machine Learning Researcher

Dr. Cescon Research Group, University of Houston

Houston, TX · –

Summer undergraduate researcher on multivariable glucose forecasting for patients with Type 1 diabetes, under Dr. Marzia Cescon.

  • Built a gradient-boosted exercise detector from wearable sensor data that caught 98.5% of exercise episodes within 30 minutes at 0.71 false alarms per day.
  • Led a multi-seed replication study in Python showing the headline results shrank to 20–50% of their reported size, which changed how the team evaluates models.
  • Designed and trained a dual-branch CNN-LSTM in TensorFlow/Keras and fixed gate saturation with a variance-floor regularizer (9 of 9 fits trained stably).
  • Found that raw wearable sensor signals directionally outperformed hand-engineered composite biomarkers for glucose forecasting across all 67 subjects.

Skills gained

  • Python
  • TensorFlow
  • Keras
  • scikit-learn
  • Gradient boosting
  • CNN
  • LSTM
  • Time-series forecasting
  • Experimental design
  • Reproducibility