Josiah Leinbach - Professional Portfolio

About Me

I am a statistician, amateur historian, and aspiring Renaissance man. I earned a B.A. in History from Hillsdale College (2020), where I was a Winston Churchill Fellow in History and Military History. Later, I earned an M.S. in Applied Statistics and M.A. in Economics from Bowling Green State University (2025).

My research interests are many and varied. Professionally, these include sampling methodology, stylostatistical analysis, demography, transit optimiziation, human performance, applications for Game Theory and Decision Theory, and efficient but ethical use of LLMs in studying, research, and workflows, to name a few.

Outside of statistics and economics, I enjoy studying foreign policy, social psychology, early modern European history, urban planning, Baroque music, and Renaissance art. I am a classically trained pianist, unapologetic Jane Austen fan, and read on nearly any subject from philosophy to physics.

In my free time, I republish out-of-print Anglican theological texts and direct the Whitaker Fellowship at Prolego Press.

Honors

3 Minute Thesis Competition (3MT) Midwest Regional Semi-Finalist (2025)

A recording of my university-level 3MT competition can be found here.

Director's Award for Public Policy Essay (Hoover Institution, Stanford University, 2024)

"'Till Death (Or Taxes) Us Do Part: Removing Marriage Penalties in the Federal EITC" (September 2024).

James A. Sullivan Award for outstanding service to the statistics department (BGSU, 2024)

Arlan P. Gilbert Award for original historical research (Hillsdale College, 2020)

Research & Publications

Microeconomic Applications of LLMs' Macroeconomic Landscape

Integrate cognitive science, developmental psychology, and social epistemology to find beneficial use-cases for LLMs.
Determine best practices for using LLMs in education, research, and office tasks.
Establish ethical principles for students, teachers, and corporate managers in using LLMs.

Feasibility of private, inter-city bus transit in northwest Ohio

Devising an economic feasibility study for a proposed (i.e. theoretical) private, inter-city bus transit company that would service cities and towns around Toledo, OH.

Stylometric analysis of the Greek New Testament

Designing various stylostatistical models for the Greek New Testament (GNT), based on New Testament scholarship, that explore the relationship between writing style and subject matter, genre, and rhetorical register.

Bletchleyism

Few topics draw together so wonderfully my love of history, statistical methods, and interdisciplinary approaches to problem-solving as does the story of Bletchley Park and the breaking of German ciphers in WWII. As such, I occasionally publish my thoughts on sundry subjects, from 16th century monarchism to social applications of Game Theory, at Bletchleyism.

Traditional BCP Parishes

I keep a running list of all traditional Book of Common Prayer (BCP) parishes in the Anglican Church in North America (ACNA), the Anglican Church of Australia (ACA), and the Church of England. Links for the parish maps and crowd-sourced entry forms can be found here. Users may submit additional parishes that are not listed on the map.

Publications

Theses

A Hidden Markov Approach to Authorship Attribution of the Pastoral Epistles. Bowling Green State Univeristy (2024). Advisor: Shuchismita Sarkar

Potential Patriots: Why the British West Indies Did Not Join the American Revolution. Hillsdale College (2020). Advisor: David Stewart

Papers

Leinbach, J., Sarkar, S., Zhu, X. (2025). A State-Restricted Hidden Markov Model for Authorship Attribution of the Deutero-Pauline and Pastoral Epistles. Under review for The Journal of the Royal Statistical Society, Series C.

Articles

History as Prologue: Winston Churchill and the Historian as Statesman. The Churchill Project, Hillsdale College (17 September 2020).

Books

Whitaker, William. A Disputation On Holy Scripture. Volume 1 and Volume 2. Edited by Josiah Leinbach. South Bend: Prolego Press, 2025.

The Churchill Document Volumes. Vol. 23, Never Flinch, Never Weary, November 1951 to February 1965. Edited by Sir Martin Gilbert and Larry P. Arnn. Hillsdale: Hillsdale College Press, 2022. Research and editorial assistance.

The Churchill Document Volumes. Vol. 22, Leader of the Opposition, August 1945 to October 1951. Edited by Sir Martin Gilbert and Larry P. Arnn. Hillsdale: Hillsdale College Press, 2019. Research and editorial assistance.

The Churchill Document Volumes. Vol. 21, The Shadows of Victory, January-August 1945. Edited by Sir Martin Gilbert and Larry P. Arnn. Hillsdale: Hillsdale College Press, 2018. Research and editorial assistance.