Featured Employee

Johnny Prettyman, P.E.

Staff Engineer III

Mr. Prettyman is a Civil Engineer with experience in Civil Design and Hydraulics. His expertise lies in hydraulic design, pipeline design, and water resources…Read More (Español)

Previously Featured Employees

Julio Juarez, CIP

General Manager, Lima

Mr. Juarez is a geological engineer with more than 15 years of experience providing geotechnical, geological and geo-environmental services to the international mining industry…Read more  (Español)

Justin W. Knudsen, P.E.

Consultant III

Mr. Knudsen is a Professional Engineer (Civil/Geotechnical B.S. and M.S.) and project manager with more than 15 years of experience in the mining industry applying his geotechnical expertise designing…Read more (Español)

Matthew L. Fuller, C.P.G., L.E.G., P.Geo, QP

Founding Principal

Engineering Geologist

Mr. Fuller is Tierra Group International, Ltd.’s Licensed Professional Engineering Geologist and Qualified Person. Matt’s professional technical experience spans more than 30 years providing geological, geotechnical, geo-environmental and geological hazards design and consulting services to the international mining industry. Matt is Tierra Group’s Chief Tailings Steward specializing in…Read More (Español)

Peter E. Kowalewski, P.E.

Founding Principal

Principal Engineer

Mr. Kowalewski is a Principal Engineer with over 27 years of experience in hydrology and hydraulics as well as geotechnical engineering of mine waste containment facilities such as heap leach facilities (HLF) and tailings dams and the design of water management facilities, such as water storage dams, spillways, and diversion canals. His experience includes permit application development and compliance for various aspects of mine operations and closure. Areas of specialty include…Read more (Español)