Dr. Geller is a full-time faculty member of the Orthopaedic Surgery Department at Montefiore Medical Center and serves as the director of the Orthopaedic Oncology Service, managing both pediatric and adult patients.  He is the co-director of Orthopaedic Surgery at the Montefiore Medical Center Moses Campus and currently serves as the Quality Improvement Officer for the Montefiore Cancer Committee.  His clinical focus involves primary and metastatic bone and soft tissue tumors, with a secondary interest in joint replacement in the setting of extensive bone loss.  He has experience in navigation-guided surgery, allograft reconstruction, endoprosthetic reconstruction, and use of custom or patient-tailored reconstructive prostheses.  His research interests include expression patterns in osteosarcoma, surgical margins in osteosarcoma, novel drug screening methods and targeted therapy for osteosarcoma using novel therapeutic modalities.  He is extensively involved in resident and medical student education.

• Morris J, Dutcher J, Geller DS. Revisiting the Orhtopaedic Management of Metastatic Renal Cell Carcinoma: Rationale for a More Aggressive Approach. Current Orthopaedic Practice. 2013 Sept/Oct; 24(5):547-551.
• Bekarev M, Elsinger EC, Villanueva-Siles E, Borzykowski RM, Geller DS. Synovial Sarcoma of the Foot. Journal of Foot and Ankle Surgery. 2013 Jul-Aug; 52(4):513-7. doi: 10.1053
• Capogna BM, Lovy A, Blum Y, Kim SJ, Flesen UR, Geller DS. Infection Rate Following Total Joint Arthroplasty in the HIV Population. Journal of Arthroplasty. 2013 Sep; 28(8):1254-8. doi: 10.1016
• Lall A, Hohn E, Kim M, Gorlick R, Abraham J, Geller DS. Comparison of Surface Area Across the Allograft-Host Junction Site Using Conventional and Navigated Osteotomy Technique. Sarcoma. 2012; 2012:197540. 
• Piperdi S, Austin-Page L, Geller DS, Ahluwalia M, Gorlick S, Gill J, Sellers R, Zhang W, Li N, Ching Sohak, Gorlick R. Beta-Catenin Does Not Confer Tumorigenicity when Introduced into Partially Transformed Human Mesenchymal Stem Cells. Sarcoma. 2012. Epub 2012 Oct 18.
• Crocco L, Gorlick R, Geller DS. Current Practice Management Regarding Thromboembolic Prophylaxis Within the Pediatric Sarcoma Patient Population, Journal of Pediatric Hematology/Oncology.2012 Sep 19. [Epub ahead of print]
•  Hall GL, Villanueva-Siles E, Borzykowski RM, Gruson KI, Dorfman HD, Geller DS. Aspergillus osteomyelitis of the proximal humerus: a case report. Skeletal Radiology. 2012 Aug; 41(8):1021-5. Epub 2012 Mar 31.
• Sambaziotis C, Plymale M, Lovy A, O’Halloran K, McCulloch K, Geller DS. Pseudoaneurysm of the Distal Thigh after Manipulation of a Total Knee Arthroplasty. Journal of Arthroplasty. 2012 Aug; 27(7); 1414.
• Shakked RJ, Geller DS, Gorlick R, Dorfman HD. Mesenchymal chondrosarcoma: Clinicopathologic study of 20 cases. The Archives of Pathology & Laboratory Medicine.  2012 Jan; 136(1):61-75.
• Hohn E, Garfein ES, Mehta KJ, Geller DS. Quadriceps Tendon Allograft Augmentation after Wide Excision of a Soft Tissue Sarcoma. Current Orthopaedic Practice. 2012 Jan/Feb; 23(1):68-71.
• Singh CK, Geller DS. The Telescopic Mating Technique for Bulk Allograft Reconstruction. Orthopaedics. 2012 Feb; 35(2):118-124.
• Sambaziotis C, Lovy A, Moadel RM, Chamarthy M, Glaser J, Jaini S, Villanueva-Siles E, Geller DS. Florine-18 Fluorodeoxyglucose Positron Emission Tomography for Osteochondromas Utilizing a Triple-Time Point Protocol.  Open Journal of Medical Imaging. 2011 Dec; 1(2):15-20.
• Hassan SE, Bekarev M, Kim MY, Lin J, Piperdi S, Gorlick R, Geller DS. Cell Surface Receptor Expression Patterns in Osteosarcoma. Cancer. 2011 Feb 1; 118(3):740-9.
• Plymale M, Lovy A, Villanueva-Siles E, Geller DS. Isolated intra-articular pseudorheumatoid nodule of the knee. Skeletal Radiology. 2011 Apr; 40(4):463-6.
• Green MC, Dorfman HD, Villanueva-Siles E, Gorlick RG, Thornhill BA, Weber RV, Geller DS. Aggressively Recurrent Infantile Myofibroma of the Axilla and Shoulder Girdle. A Case Report. Skeletal Radiology.2010 Mar; 40(3):357-61.
• Geller DS, Pope JB, Thornhill BA, Dorfman, HD. Cryptococcal pyarthrosis and sarcoidosis. Skeletal Radiol. 2009 Jul; 38(7):721-7.
• Sah A, Geller DS, Mankin HJ, Delaney T, Rosenberg A, Wright C, Hornicek FJ. Malignant Transformation of Synovial Chondromatosis of the Shoulder to Chondrosarcoma - A Case Report," Journal of Bone and Joint Surgery. 2007 Jun; 89(6):1321-8.
• Geller DS, Hornicek FJ, Mankin HJ, Raskin KA. “Soft Tissue Sarcoma Resection Volume Associated with Wound-Healing Complications,” Clinical Orthopaedics and Related Research. 2007; 457:182-5.
• Ames JA, Abraham JA, Geller DS, Goldsmith J, Gebhardt MC.  Proximal Tibial Lesion in a Young Adult: Early Diagnosis Allowing Unique Reconstruction.  The Orthopaedic Journal at Harvard Medical School. 2006 Aug: 143-7.
• Gardner MJ, Yacoubian S, Geller DS, Pode M, Mintz D, Helfet  DL,  Lorich DG. “Prediction of Soft-Tissue Injuries in Schatzker II Tibial Plateau Fractures based on Measurements of Plain Radiographs,” Journal of Trauma-Injury Infection & Critical Care. 2006; 60(2):319-324.
• Steinberg EL, Geller DS, Yacoubian SV, Shasha N, Dekel S, Lorich DG. “Intramedullary Fixation of Tibial Shaft Fractures Using an Expandable Nail,” Journal of Orthopaedic Trauma.  2006 May; 20(5):303-9.
• Gardner, MJ, Yacoubian S, Geller DS, Suk M, Mintz D, Potter H, Helfet DL, Lorich DG. “ The Incidence of Soft Tissue Injury in Operative Tibial Plateau Fractures,” Journal of Orthopaedic Trauma.  2005; 19:79-84.
• Lorich DG, Yacoubian SV, Geller DS. “Intramedullary Fixation of Humeral Shaft Fractures Using an Inflatable Nail,” Orthopaedics. 2003 Oct; 26(10):1011-4.
• Lorich DG, Geller DS, Yacoubian SV, Leo AJ, Helfet DL. “An Innovative Mode of Intramedullary Fixation,” International Review of Modern Surgery, March 2002.
• Westrich GH, Geller DS, O’Malley MJ, Deland JT, Helfet DL. “Anterior Iliac Crest Bone Graft Harvesting Using the Cortico-Cancellous Reamer System,” Journal of Orthopaedic Trauma. 2001 Sep-Oct; 15(7):500-6.