Natural Stone Institute 2019 Board of Directors


Greg Osterhout

Greg Osterhout

Northern Stone Supply
P.O. Box 249
Oakley, ID 83346
Phone: 208.862.3353


Robert Zavagno

Robert Zavagno
Vice President/President-Elect

Cleveland Marble Mosaic Co.
4595 Hinckley Industrial Parkway
Cleveland, OH 44109
Phone: 216.749.2840
Zone 14: At Large


David Carnevale

David Carnevale
Immediate Past President
Carnevale & Lohr, Inc.
6521 Clara St.
Bell Gardens, CA 90201
Phone: 562.927.8311

Kathy Spanier

Kathy Spanier

17482 Granite West Road
Cold Spring, MN 56320-2593
Phone: 320.685.3621



Michael Picco

Mike Picco

PICCO Engineering
8611 Jane Street, Suite 200
Concord, ON
Phone: 905.760.9688 ext 223
Zone 8: Canada


Herwig Callewier

Herwig Callewier
Director (2017-2021)

Beltrami Natural Stone
Benetielaan 22, Harelbeke, VL
Belgium  B-8530
Phone: + 32 56 23 70 00
Zone 10: Europe


Evan Cohen

Evan Cohen
Director (2019-2022)

Quality Marble & Granite
731 South Taylor Avenue
Phone: 909.983.0655
Zone 7: Alaska, California, Hawaii, Oregon, and Washington


Leonardo De Tatagiba

Leonardo De Tatagiba
Director (2018-2022)

Granitos Zucchi
Av Jacaraipe, 1423 – Jacaraipe
Serra ES,  Brazil 29173-392
Phone: +55 27 3243 9666
Zone 9: Central & South America, Mexico, Puerto Rico, and the Caribbean


Mariavittoria Grassi

Mariavittoria Grassi
Director (2018-2022)

Grassi Pietre srl
Via Madonetta, n 2
Nanto VI, VIItaly 36024
Phone: +39 329 4386100
Zone 15:  At-Large


Ali Kader

Ali Kader
Director (2017-2021)

Egy-mar International
LOB 09 Office No. 115 Jebel Ali Free Zone
P.O. 18382 Dubai,  United Arab Emirates  18382
Phone:  +20 12 23 19 21 02
Zone 11:  Africa and Middle East


Bruce Knaphus

Bruce Knaphus
Director (2016-2020)

KEPCO+, Inc.
1987 South 700 West
Salt Lake City, UT 84104
Phone: 801.975.0909
Zone 6: Rocky Mountain: Colorado, Idaho, Kansas, Minnesota, Montana, Nebraska, Nevada, New Mexico, North Dakota, South Dakota, Utah, and Wyoming


Joshua Levinson

Joshua Levinson
Director (2015-2019)

Artistic Tile
520 Secaucus Rd.
Secaucus, NJ 07094
Phone: 201.864.7000
Zone 2: Mid-Atlantic:  District of Columbia, Delaware, Maryland, New Jersey, North Carolina, Virginia, and West Virginia


Duane Naquin

Duane Naquin
Director (2017-2021)

Stone Interiors East
131 Palmetto Court
Gaston, SC  29053
Phone:  803.461.8950
Zone 3: Southeast: Alabama, Florida, Georgia, South Carolina, and Tennessee


Badia Ontra

Badia “Buddy” Ontra
Director (2016-2020)

Ontra Stone Concepts
541 Central Ave.
Bridgeport, CT 06607
Phone: 203.367.4757
Zone 1: Northeast:  Connecticut, Maine, Massachusetts, New Hampshire, New York, Pennsylvania, Rhode Island, and Vermont


Katie Peralta

Katie Peralta
Director (2019-2022)

Triton Stone Group
6131 River Rd.
Harahan, LA 70123
Phone: 504.738.2228
Zone 5: South Central: Arkansas, Louisiana, Mississippi, Oklahoma, and Texas


Marcella Prado

Marcella Prado
Director (2018-2022)

Laticrete International
1700 Montrose Ln.
Lincoln, CA  95648
Phone: 203.859.2069
Zone 13: Associate Members


Bernard Van Etten III

Bernard Van Etten III
Director (2015-2019)

Murphy Marble Co.
11756 South Halsted St.
Chicago, IL 60628
Phone: 773.928.7114
Zone 4: Midwest: Iowa, Indiana, Illinois, Kentucky, Michigan, Missouri, Ohio, and Wisconsin


Josh Zhang

Josh Zhang
Director (2018-2022)

Jianming Stone Group
Unit 14 C109, Zhenhua Building, Dongdu Road, Xiamen, China
Phone: +86-13806020460
Zone 12: Pacific Rim: Asia, Australia, and Philippines



Board Nominations

Nomination Deadline - August 31, 2019

If you are interested in serving or know someone interested in being a board member candidate, please contact 2019 Nominating Committee Chair, David Carnevale or Natural Stone Institute CEO, Jim Hieb.

Natural Stone Institute Executive Staff

Jim Hieb, CAE
380 E. Lorain Street
Oberlin, OH 44074
Phone: 440.250.9222
Fax: 440-774-9222

Executive Vice President
Jane Bennett
36 Cougar Lane
Chestertown, NY  12817
Phone: 440.250.9222
Fax: 440-774-9222


Professional Staff at Natural Stone Institute Headquarters

Technical Director
Chuck Muehlbauer
5743 Spruce Street
St. Cloud, Minnesota 56303

CEU Administrator
Sarah B. Gregg



Stones of North America

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