About Us

Ms. Treptow has more than 30 years of professional experience in environmental regulatory compliance and resource management. In 1999, she established EnviroSystems Management, Inc., in Flagstaff, Arizona. Ms. Treptow has worked closely with Federal agencies to develop research programs, such as mitigation, in-kind mitigation, avoidance techniques, and other innovative techniques to reduce adverse effects to the environment. She is extremely well-versed in environmental law and its interpretation, which is an instrumental skill as an agency liaison, particularly in meeting all regulatory requirements in a cost-effective and efficient manner. She focuses compliance efforts on issues of highest impact, directly benefiting our clients. Ms. Treptow’s extensive resource knowledge and experience is essential for successful project completion, and fosters EnviroSystems’ company-wide cooperation with agencies and clients.

Email: streptow@esmaz.com

Mr. Hart has 25 years of experience in cultural resources management. He has directed, managed, or participated in more than 500 projects throughout Arizona, California, Illinois, Florida, Louisiana, Nevada, New Mexico, Texas, and Utah, as well as Cuba and Mexico. Projects range from cultural resources overviews, archaeological survey, eligibility and data testing, and data recovery. As Cultural Resources Division Director, he ensures quality from field methods to research and report preparation. He is accustomed to working on large, complex and politically-charged projects that are exceptionally challenging due to multiple land jurisdictions, and the often-competing interests of agencies.  In an arena with such diverse and competing interests, Mr. Hart acts as liaison between stakeholders and strives to work with each agency and land manager to ensure that concerns are met with sincere consideration and understanding, which facilitates the compliance process.  Mr. Hart has extensive knowledge of Section 106 and Section 110 of the NHPA, and he exceeds the Secretary of the Interior’s Professional Standards for Archaeology.

Email: dhart@esmaz.com

Ms. Markussen is the Geospatial/GIS Division Director and Supervisory Archaeologist for EnviroSystems. She earned her master’s degree in Anthropology with a focus in computer and advanced spatial technologies in archaeology. Ms. Markussen has worked with GIS for over 20 years and has specialized in geophysical prospection in archaeology for a majority of that time. At EnviroSystems, Ms. Markussen oversees all aspects of geospatial data collection, processing, and production. Her experiences as both an archaeologist and GIS Specialist provide a unique resource in terms of geospatial data collection, display, analysis, and map production. Her background and experiences are emphasized by her additional lead roles on projects involving ground penetrating radar (GPR), photogrammetric mapping, and 3-D mapping for cultural resources. While conducting archaeological and geospatial surveys in the Southwest, Ms. Markussen also travels worldwide (Canada, U.K., Europe, Africa, Middle East, Caribbean) to perform archaeological geophysical prospection surveys (magnetometry, resistivity and GPR).

Email: cmarkussen@esmaz.com

Ms. Lowe has a Master of Business Administration degree from the Thunderbird School of Global Management and is licensed as an Arizona Certified Public Accountant. Ms. Lowe brings over 30 years of industry-diverse business experience to EnviroSystems Management, Inc. as the Chief Financial Officer.

Email: glowe@esmaz.com

With over 22 years of experience in healthcare practice management, Ms. Meyers has well-honed skills in coordinating all aspects of office activities.  She organizes and coordinates administration duties and office procedures to create and maintain a pleasant work environment, ensuring high levels of organization and communication.  She is reliable, professional, and efficient and continually strives to improve functionality of the workplace.

Email: jmeyers@esmaz.com

Mr. Whiting began his career in fisheries management in the Intermountain Region and in the Great Basin. During this period, his interests were focused on the prehistory and history of the region. Since 2002 Mr. Whiting has been actively involved in public and private sector archaeology. His diverse background and work experience in Nevada, Utah, Arizona, Colorado, and New Mexico have enabled him to reach supervisory levels within cultural resources management. He currently serves as Principal Investigator / Project Manager / Senior Archaeologist for EnviroSystems based in Flagstaff, Arizona. Mr. Whiting has conducted all phases of archaeological investigations including research, cultural resources inventory, damage assessments, monitoring, testing and data recovery excavations, analysis, and reporting. His primary interests are in the prehistoric land use patterns of the Anasazi and Great Basin regions. Recent project experience includes working as the Project Director and Principal Investigator for numerous cultural resource surveys over thousands of acres for the BLM in Utah, Colorado, and Nevada.

Email: jwhiting@esmaz.com

Mr. Deats has been a practicing archaeologist since 1987 in both the public and private sectors. He has conducted all phases of archaeological and historical investigations including archival research, cultural resources inventory, archaeological testing and excavation; historic and prehistoric artifact and building analyses and photography; data compilation and analysis, report preparation, laboratory management, and collections processing and curation. He has been Project Manager and/or Field Director for more than 45 major projects and authored/co-authored over 80 technical reports and cultural resource treatment plans. He has extensive experience with NHPA Section 106 compliance and working to address the special concerns of American Indian groups in regard to archaeological undertakings, particularly in the treatment of human remains. Mr. Deats has over 28 years of archaeological experience in the Southwest, including working for both the Navajo Nation and Zuni archaeology programs. In addition, he has experience and special interest in geology, historical archaeology, ground stone research, and public education.

Email: sdeats@esmaz.com

Mr. Brown, a professional archaeologist since 1997, has worked on well over 450 projects throughout the state of Arizona, Southern and Central California, Utah, New Mexico, Texas, Nevada, Colorado, Idaho, and Egypt. He has been a crew member and Field/Project Director on numerous excavations of prehistoric village sites in the Phoenix Basin and surrounding areas and has been directly involved in the excavation and preliminary in-field analysis of over 200 human burials. He participated in numerous backcountry surveys and stabilization projects at Grand Canyon National Park (GRCA) and served as a GRCA Fire Archaeologist/Firefighter Type 2 and Resource Advisor. Mr. Brown has worked extensively with Federal and State Parks, the Bureau of Land Management, Bureau of Reclamation, U.S. Fish and Wildlife Service, U.S. Forest Service, U.S. Customs and Border Protection and U.S. Border Patrol, the U.S. Army Corps of Engineers, and a multitude of military installations. Mr. Brown is currently permitted as a Field/Project Director on various public lands (primarily USFS and BLM) throughout the intermountain west. His skills also include archaeomagnetic and micromorphological sample collection; artifact, osteopathology and human remains illustration for technical reports and publications; and digital photography of artifacts, petroglyphs panels, and architectural documentation for technical reports, 3D-scan overlays, 3D photogrammetry, and for archival curation. In the lab, Blayne has conducted rough-sort analysis of lithic and ceramic artifacts and has performed detailed analysis and write-up of flaked stone debitage, lithic tools, ground stone, ceramics, shell, faunal remains, and perishables (Hohokam and Grand Canyon regions). In addition, he has processed flotation samples and prepared artifacts for curation and repatriation. With a strong interest in lithic tools and prehistoric technologies, Mr. Brown is involved in public outreach and training; he gives talks and demonstrations on lithic technologies and prehistoric tool use, has spoken at the Hiking Guide Training Seminar and lead volunteer-based field projects for the Grand Canyon Conservancy Field Institute, and is often commissioned to create reproduction artifacts for National Park Service teaching collections, experimental archaeological studies, and for use during archaeological and cultural resource awareness events.

Email: bbrown@esmaz.com

Mr. Ellison has more than 20 years of experience in cultural resources management. He has participated in more than 400 projects throughout Arizona, Utah, Nevada, New Mexico, Idaho, California, Texas, Kansas, Oklahoma, and Arkansas as an archaeologist and/or GIS specialist. He has conducted all phases of archaeological and historical investigations, including archival research, cultural resources inventory, archaeological testing and excavation, site mapping, artifact analysis, data compilation, report preparation, and curation. As a GIS Specialist, Mr. Ellison works closely with cultural and environmental resources principle investigators and clients for their specific project-dependent geospatial requirements. His experiences as both an archaeologist and GIS Specialist contribute to his ability to provide field personnel with accurate field maps, comprehensive data dictionaries, and background files for efficient navigation on survey efforts. He has managed complex spatial data sets for large multi-phase and geospatially intricate projects.

Email: tellison@esmaz.com

Ehren Keltz is an archaeologist specializing in prehistoric stone tools/lithic technologies. Ehren started his studies of Southwest archaeology in 2012 in Tucson, Arizona at Pima Community College (PCC) and completed his Master’s degree in 2019 from Northern Arizona University (NAU) in Flagstaff, Arizona. He has worked mostly in Arizona, but has also gained experience working in Utah, Nevada, California, and New Mexico. Many projects Ehren works on are for federal agencies, including the National Park Service (NPS), the Bureau of Land Management (BLM), and the Forest Service (USDAFS) and he always meets the Secretary of the Interior’s professional standards for archaeology. Ehren participated in numerous backcountry surveys, List of Classified Structures condition assessments, and stabilization projects at Grand Canyon National Park (GRCA). Additionally, Ehren is involved in public outreach and training; he gives talks and demonstrations about stone tool manufacturing techniques and flake reduction stages and morphology primarily at GRCA and NAU. He learned to flintknapp originally from Allen Denoyer in Tucson in 2012 and then by Blayne Brown and Dr. John Whittaker in Flagstaff in more recent years. He has co-led and led crews for the Grand Canyon Conservancy Field Institute (GCCFI) cultural projects, instructing the participants in field methods, artifact identification, and site stewardship. With Ehren’s artistic upbringing, abilities, and motivation to constantly learn new skills, he has become proficient in many necessary field activities and techniques and learns new skillsets quickly. Ehren is most skilled at mapping in the field, artifact illustrations, photography, and has an eye for precision and accuracy. He has also gained experience using ArcGIS from classes at NAU, for his Master’s thesis, and work at GRCA, creating varying types of maps for the fire archaeologist. During Ehren’s time doing cultural resource management (CRM), he has had to gather, compile, interpret, and report data in compliance with different state, federal, and tribal regulations.

Email: ekeltz@esmaz.com

Crispin Wilson officially began his career in archaeology while attending graduate school at Northern Arizona University (2019-2020) but his interest and study of the discipline began much earlier in life. An avid outdoorsman, Crispin has found that Section 106 compliance in the American Southwest allows him to dovetail his personal passions and professional aspirations. Crispin’s attention to detail and motivation to learn new skills and concepts enabled him to make a meaningful contribution to our understanding of precontact southwestern cultural processes through his master’s research and gives him an edge as a professional archaeologist. During Crispin’s time doing cultural resource management (CRM), he has had to gather, compile, interpret, and report data in compliance with different state, federal, and tribal regulations.

Email: cwilson@esmaz.com

Ms. Phillips began her career in archaeology in 2015 at the University of Kentucky Archaeological Research Facility where she learned and refined skills in data recovery, shovel test survey, and prehistoric/historic artifact processing, analysis, and curation. She participated in two field schools—one in northern Kentucky excavating a Late Prehistoric longhouse, and another in the Koobi Fora region of Kenya researching Plio-Pleistocene lithics. Her experience also includes archaeological survey and research in Arizona, New Mexico, Utah, Georgia, South Carolina, and West Virginia. Since moving to the southwest, she has performed pedestrian survey, site recording, and reporting in a variety of regions and has also supervised stabilization activities on prehistoric cliff dwellings and structures. Ms. Phillips has worked on projects for several federal agencies, including the Forest Service, Park Service, Bureau of Indian Affairs, and Army Corps of Engineers. She has also worked with state, county, and private clients, such as Navajo Department of Transportation, Arizona Game and Fish, Arizona Department of Emergency and Military Affairs, and Utah Division of Wildlife Resources. Her primary interests include Ancestral Puebloan archaeology of northern Arizona and lithic technology.

Email: ephillips@esmaz.com

Mr. Stein has been a practicing archaeologist since 2018, primarily in the private sector. He began in archaeology by graduating from Northern Arizona University with a Bachelor of Arts degree in 2013. That same year he attended field school. He began his profession career involving Section 106 (of the National Historic Preservation Act) compliance as a graduate student and then starting for consulting firms. In that time, he has acted in both supervisory and technician roles conducting archaeological inventories and excavations, archival research, evaluating the National Register of Historic Places (NRHP) eligibility of sites, site and historic building mapping and documentation prehistoric and historic artifact analysis and photography. He has worked with federal, state, county, and private clients, such as the United States Forest Service, Bureau of Land Management, Arizona Game and Fish, Arizona Department of Emergency and Military Affairs, and Utah Division of Wildlife Resources. His areas of expertise include field survey methodologies, site documentation, artifact identification and analyses, field crew leadership, NRHP eligibility evaluation, historic research, and heritage and community outreach. Mr. Stein has participated on archaeological projects in Arizona, Colorado, New Mexico, and Utah.

Email: kstein@esmaz.com

Mr. Wyser started his studies of Southwest archaeology in 2017 in Flagstaff, Arizona at Coconino Community College and completed his bachelor’s degree in 2019 from Northern Arizona University. He has participated on archaeological projects in Arizona, Utah, New Mexico, and Colorado. Ryan has worked on projects for federal, state, county, and private clients, including the Bureau of Land Management, the Bureau of Indian Affairs, the Forest Service, the Department of Homeland Security, and the United States Customs and Border Protection’s, and he always meets the Secretary of the Interior’s professional standards for archaeology. During Ryan’s time doing cultural resource management and environmental monitoring, he has had to gather, compile, interpret, and report data in compliance with different State, Federal, and Tribal regulations. His areas of expertise include field survey methodologies, site documentation, artifact identification and analyses, field crew leadership, and National Register evaluation.

Email: rwyser@esmaz.com

As a biologist for 17 years Eric Herman’s field time totals thousands of hours surveying, capturing, handling, sampling, studying, and writing about flora/fauna. His studies have spanned government agencies, private companies, non-profits, and his personal interests. Eric’s extensive survey experience has fostered a keen knowledge in setting up a surveys for a variety of species and project areas; from one acre to thousands of acres in size, linear corridors to broad swaths, private and public land, and throughout several biotic communities of the southwest. He is proficient in the use of all field equipment required to conduct successful surveys. Survey experience includes migratory bird nests, yellow-billed cuckoo, flat-tailed horned lizard, bird removal, Chiricahua leopard frog, and native plants in the southwestern US. Additionally, he volunteers at Wild at Heart, a raptor nonprofit rescue. He has gone into the field to rescue injured raptors, monitored eating habits of rescued birds, and constructed burrowing owl habitat. This experience has taught him safe and proper handling methods when handling raptors of all sizes.

Email: Eric.Herman@atozec.com

Mr. Uehling is a reclamation scientist with a background in soils science, hydrology, vegetation management, and GIS. He has directed, managed, and participated in the treatment and rehabilitation of over 100,000 acres of disturbed lands in Arizona, Utah, Wyoming, North Dakota, and Montana. He regularly implements recommendations, such as seeding and soil amendments and noxious weed management to expedite the reclamation process and mitigate stormwater issues, ensuring his clients are in compliance with applicable laws. He is also a Certified Environmental Inspector and has prepared Phase I ESAs in accordance with the ASTM Standards. As EnviroSystems’ Noxious Weed and Vegetation Management Coordinator, he has managed projects ranging in size from 50-1,000 acres in locations varying from road right-of-ways to backcountry wilderness areas. Mr. Uehling coordinates logistics for each job, hires and trains new employees, repairs, maintains, and calibrates all weed spraying equipment, prepares field maps, and employs GPS and GIS technology to plan daily work efforts and perform quality control. He currently holds pesticide applicator licenses in Arizona and Utah, and has held licenses in Montana and Wyoming in recent years.

Email: nuehling@esmaz.com

Mr. Ventrella is a natural resource specialist with a background in ecological restoration, vegetation management, monitoring and GIS. Mr. Ventrella has managed and participated in various scientific studies, restoration projects and vegetation management on public lands in Arizona, Nevada, Utah, Oregon and the Southeastern United States. Mr. Ventrella has experience collecting a range of plant materials from various ecosystems to be stored or used in restoration projects, as well as seeding and plantings. Mr. Ventrella has managed crews on large projects collecting precise ecological data, along with invasive species removal and treatment projects. Using heavy machinery and hand tools, Mr. Ventrella has participated in numerous restoration plantings in upland and riparian plant communities. Most of this work has been conducted in remote and rugged environments, where safety and awareness are paramount.

Email: zventrella@esmaz.com