Joshua Semeter is a Boston University professor of electrical and computer engineering and director of the Center for Space Physics whose public UAP relevance began when NASA appointed him to its UAP Independent Study Team on October 21, 2022.12 His contribution to the UAP conversation is sensor physics, ionospheric science, radar, optical remote sensing, and data interpretation.123
Space Physics Before the UAP Panel
Boston University's Center for Space Physics identifies Semeter as director of the center and describes his work in ionospheric and space-plasma physics, radar signal processing, airglow and auroral spectroscopy, optical sensors, image reconstruction, and tomography.1 The BU College of Engineering profile separately lists his 1997 PhD in electrical and computer engineering from Boston University, his faculty role, and honors including an NSF CAREER Award, the SRI Presidential Achievement Award, and a PECASE award.3 The National Academies' Solar and Space Physics Decadal Survey roster describes his career path as a control-systems engineer at Pratt & Whitney Aircraft, a Max Planck postdoctoral fellow, a senior research engineer at SRI International, and a BU professor whose research uses radio remote sensing, optical remote sensing, satellite observations, physics-based modeling, and physics-based data fusion.4 His PSW Science lecture biography gives the same education arc from a BS in electrical engineering at the University of Massachusetts Amherst to MS and PhD work at Boston University and describes him as the author of more than 100 technical papers.5
Why NASA Selected Him
NASA announced Semeter as one of sixteen members of the UAP Independent Study Team on October 21, 2022, with the study beginning on October 24 and running for nine months under chair David Spergel.2 NASA's member biography connected Semeter's selection to optical and magnetic sensors, radar design, signal processing, computational imaging, and tomographic inversion for distributed, multi-mode measurements.2 Semeter told BU in November 2022 that the panel was intended to advise NASA on what information would be needed to advance a scientific study of UAP, not to solve the mystery from the existing record.6 He also told BU that many existing government sensors were built for combat and targeting missions rather than fundamental scientific research, making the quality and context of the data the central issue.6
Infrared Cases and the GoFast Reappraisal
At the team's May 31, 2023 public meeting, NASA presented the study as a scientific review of available data sources, collection methods, and analytic standards for UAP rather than an adjudication of every prior sighting.7 The final 2023 NASA UAP study report listed Semeter as a Boston University panelist and concluded that UAP analysis was hampered by poor sensor calibration, insufficient multiple measurements, missing sensor metadata, and weak baseline data.8 In his 2025 PSW Science lecture, Semeter used the Navy GoFast video to show how apparent speed can be distorted by range, altitude, sensor angle, and parallax; the meeting report says his reconstruction put the most probable speed around 35 to 40 miles per hour, consistent with wind drift rather than extraordinary propulsion.5 AARO later published a GoFast case resolution card that reached a non-anomalous-speed assessment while also noting limits in the record, including reliance on publicly released compressed video, unavailable original metadata, and no direct witness accounts.9
Public Science Network After NASA
After the NASA report, Semeter's UAP public role remained tied to scientific communication and sensor analysis: GBH announced NOVA's 2025 documentary What Are UFOs? as featuring Semeter and former AARO director Sean Kirkpatrick, and BU Engineering described Semeter's contribution as demonstrating infrared imaging, parallax, and forced-perspective problems in UFO videos.1011 Semeter told BU Engineering that his initial interest began as skepticism and broadened when pilot reports made the problem difficult to dismiss as simple misperception or hoax.11 His continued placement on the National Academies decadal survey steering committee kept his main professional network in space physics, remote sensing, and heliophysics rather than UFO advocacy.4
Sensor Standards and Evidentiary Limits
As a mainstream space physicist with radar, optical, and inversion expertise, Semeter helped NASA push UAP analysis toward calibrated sensors, metadata, repeatable methods, and environmental context.28 NASA's final report said the existing public record lacked the consistent, detailed, curated observations needed for definitive scientific conclusions, and NASA's FAQ says the independent study team found no evidence suggesting an extraterrestrial origin for UAP.812 His GoFast analysis and AARO's later case card both treated the disputed observation as a measurement and reconstruction problem before making claims about origin.59