Selected Honors & Awards

Michigan Micro Mote & MBus

The Michigan Micro Mote, or M3 project, aims to bring general-purpose computing and sensing to millimeter-scale devices. As part of this effort, we identified the system interconnect as a key impediment to further scaling the energy and area of embedded computing. To address this, I led the design of MBus, a new chip-to-chip interconnect optimized for energy-conscious designs.

Cubeworks is commercializing the M3 technology.

{ JSTS'16 | Micro Top Picks '16 | ISCA'15 | WARP'15 | CICC'14 | VLSI'14 | VLSI'14 | JSSC'13 }


Location information is a key aspect of context-aware computing. Making location a first-class computational resource, like time synchronization or networking today, is critical to realizing visions of intelligent and reactive environments.

I have worked on several localization efforts, tackling different applications:

  • Slocalization. For most of modern history, massive effort has gone into the careful organization, sorting, and filing of information for later retrieval. With the rise of the Information Age, we have transitioned from filing information to simply searching for it on demand, expecting our computing infrastructure to automatically find exactly what we are searching for. The same is not yet true for the physical world. While there are exceptions, the vast majority of things in the physical world remain invisible to the computational domain. Slocalization takes one small step towards enabling "search not file" for the physical world, demonstrating a sub-microwatt tag that can be localized with decimeter accuracy in complex, indoor environments using ultra wideband backscatter.
    { IPSN'18 }
  • SurePoint. In late 2013, DecaWave released the first (and as of 2018 still only) commercially available ultra wideband transciever. While ultra wideband provides the potential for extremely accurate range estimates, in practice single range estimates can exhibit variation well over a meter. SurePoint explores what's required to build a scalable, high-fidelity, and high-reliability (29 cm 50th percentile, 77 cm 99th percentile accuracy of raw range estimates) system atop a UWB ranging primitive.
    { SenSys'16 | HotWireless'15 }
  • Harmonium. Ultra wideband tracking (order 1-10 cm) with only narrowband components of lightweight (3 g), low power (75 mW or 3.9 mJ/fix), low cost (< $5 USD), fast-moving (up to 2.4 m/s) tags.
    { TOSN'18 | IPSN'16 | MC2R'15 | HotWireless'14 }
  • Luxapose. An exploration in using lighting infrastructure for astral navigation indoors. Luxapose spawned considerable follow-on work (with which I have no affiliation) that is really cool and looks at how to do this without requiring intelligent LED lighting infrastructure, in particular check out LiTell and some of Xinyu's other light-based localization work.
    { MobiCom'14 }
  • Opo. An exploration in relative location, a low-power (126 J/day) wearable badge that provides high fidelity (centimeter-accurate, second-level granularity) human interaction information.
    { SenSys'14 }

The Tock Operating System

Low-power microcontrollers lack some of the hardware features and memory resources that traditionally enable multiprogrammable systems. Accordingly, microcontroller-based operating systems have not provided important features like fault isolation, dynamic memory allocation, and flexible concurrency. However, an emerging class of embedded applications are software platforms, rather than single purpose devices, and need these multiprogramming features. Tock, a new operating system for low-power platforms, takes advantage of limited hardware-protection mechanisms as well as the type-safety features of the Rust programming language to provide a multiprogramming environment for microcontrollers.

Tock isolates software faults, provides memory protection, and efficiently manages memory for dynamic application workloads written in any language. It achieves this while retaining the dependability requirements of long-running applications.

{ SOSP'17 | APSys'17 | PLOS'15 }

The Signpost City-Scale Sensing Project

City-scale sensing holds the promise of enabling deeper understanding of our urban environments. However, a city-scale deployment requires physical installation, power management, and communications—all challenging tasks standing between a good idea and a realized one. The Signpost project aims to provide a platform that enables easy deployment and experimentation for city-scale applications.


{ IPSN'18 }


These are the conferences I generally follow, courtesy of ConfSearch.

I am happy to share slides from any presentation I give. I generally try to post slides from major talks, but if something is missing that you are interested in, please reach out and I will add it.

I have been fortunate to be successful in many fellowship applications. This is due in no small part to excellent guidance from my colleagues and mentors. I am happy to share some of that advice and my application materials here.

One of my favorite parts of grad school is the opportunity it has afforded me to travel the world. Here's all the countries I've made it to thus far (also US states I've spent any appreciable time in).