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The main office for the Maryland-Delaware-DIstrict of Columbia Water Science Center is located in Catonsville, MD with field offices in Dover, DE and Frostburg, MD. Our staff consists of scientists, technicians, and support personnel who are committed to providing accurate and timely information to MD, DE, DC, and the Nation.

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Employee Directory

Job Title Name Email Sort descending Phone
Research Hydrologist Allen C Gellis, Ph.D. agellis@usgs.gov 443-498-5581
Hydrologic Technician A.J. Greise ajgreise@usgs.gov 301-687-0919
Ext: 14
Physical Scientist Andrew Sekellick ajsekell@usgs.gov 443-498-5580
Geographer Andrew E LaMotte alamotte@usgs.gov 443-498-5549
Hydrologic Technician Ashley M Ryan aryan@usgs.gov 443-498-5694
Physical Scientist Alexander Soroka asoroka@usgs.gov 302-734-2506
Ext: 224
Supervisory Hydrologic Technician Anthony Tallman atallman@usgs.gov 302-213-5061
Supervisory Hydrologic Technician Brian Banks bbanks@usgs.gov
Supervisory Hydrologic Technician Brenda Majedi blfeit@usgs.gov 443-498-5527
Hydrologic Technician Brett Mcfarland bmcfarland@usgs.gov 443-498-5664
Physical Scientist Betzaida Reyes breyes@usgs.gov
Physical Scientist Breck M Sullivan bsullivan@usgs.gov 443-498-5500
Hydrologist Cheryl Dieter cadieter@usgs.gov 443-883-0761
Hydrologic Technician Christopher R Lewis crlewis@usgs.gov 302-213-5056
Associate Director for Data Charles Walker, Ph.D. cwwalker@usgs.gov 443-498-5523
Chemist Durga Ghosh dghosh@usgs.gov 410-267-5750
Hydrologic Technician David Brower dpbrower@usgs.gov 443-498-5547
Hydrologic Technician Elizabeth Marchand ehmarch@usgs.gov 443-498-5500
Hydrologic Technician Eric Boyd elboyd@usgs.gov 301-687-0919
Hydrologist Emily H Majcher, PE emajcher@usgs.gov 443-498-5520
Deputy Center Director Ethan Weikel, P.G. eweikel@usgs.gov 443-498-5543
Hydrologic Technician Fisseha Mengistu fmengistu@usgs.gov 443-498-5532
Supervisory IT Specialist Gwen Kvech gmhatten@usgs.gov 443-498-5533
Hydrologic Technician James Broadwater jebroadw@usgs.gov 301-687-0919
Ext: 13
Research Oceanographer Jenna Brown, PhD jennabrown@usgs.gov 302-213-5071
Hydrologist John C. Hammond, PhD jhammond@usgs.gov 443-498-5568
Administrative Officer (Acting) Joseph P Jenkins jjenkins@usgs.gov 443-498-5512
Hydrologic Technician Jeffrey E Klein jklein@usgs.gov 443-833-5775
Hydrologic Technician Jeremy Malen jmalen@usgs.gov 443-285-9059
Hydrologist/Groundwater Specialist Jeff P Raffensperger, Ph.D. jpraffen@usgs.gov 443-498-5542
Hydrologic Technician John Tapscott jtapscott@usgs.gov 443-498-5500
Deputy Director, Integrated Modeling and Prediction Division John Brakebill jwbrakeb@usgs.gov 443-498-5557
Student of Hydrology Kelly McVicker kmcvicker@usgs.gov 443-498-5500
Physical Scientist Lillian E Gorman Sanisaca lgormansanisaca@usgs.gov 443-498-5546
Pathways Student Hydrologic Technician Logan Jeffries ljeffries@usgs.gov 301-687-0919
Web Developer/Digital Content Manager Lonnie R. Lanham lrlanham@usgs.gov 443-498-5599
Hydrologic Field Assistant Leah E. Staub lstaub@usgs.gov 240-470-0870
Hydrologic Technician Michael Clark maclark@usgs.gov 301-687-0919
Ext: 11
Hydrologic Technician Michael Geissel mcgeisse@usgs.gov 443-498-5522
Geographer/GIS Specialist Michael E Wieczorek mewieczo@usgs.gov 443-498-5550
Supervisory Hydrologist Matthew G Pajerowski mgpajero@usgs.gov 443-498-5506
Center Director Mary Kay Foley, P.E., PMP mkfoley@usgs.gov 443-498-5501
Physical Scientist Marina Metes mmetes@usgs.gov 443-498-5576
Research Hydrologist Michelle Lorah mmlorah@usgs.gov 443-498-5601
Supervisory Geographer Mark R Nardi mrnardi@usgs.gov 302-213-5057
Hydrologic Technician Michael Brownley msbrownl@usgs.gov 302-213-5055
Hydrologic Field Assistant Nicole Bellmyer nbellmyer@usgs.gov 443-498-5500
Supervisory Geographer Natalie C Hall, PhD nhall@usgs.gov
Chesapeake Bay Monitoring Coordinator/Acting Deputy Director (Detail 2020) Peter Tango, Ph.D. pjtango@usgs.gov 443-510-0486
Hydrologist Rosemary M Fanelli, Ph.D. rfanelli@usgs.gov 919-571-4036
Hydrologic Technician Sarah Queen sjqueen@usgs.gov 443-743-0283
Supervisory Hydrologic Technician Matt Baker smbaker@usgs.gov 301-707-5491
Hydrologist/Water Quality Specialist Scott Ator swator@usgs.gov 443-498-5564
Hydrologic Technician Todd Lester tlester@usgs.gov 410-422-2489
Hydrologist Trevor P Needham, PhD tneedham@usgs.gov 443-498-5584