McLellan remains a Professor Emeritus of Food Science at the University of Florida. He is a food scientist of over 30 years in process technology-fruit and vegetable systems. He is a past IFT Food Science Communicator. His specialization is in process technologies for juice and liquid food products including products such as fresh, purees, canned dried, storage systems and packaging. His process technology expertise spans extraction, clarification, filtration, dehydration, packaging systems, sensory analysis, membrane, and concentration. He has been a expert witness in legal issues pertaining to food processing and food safety.

The Science Board provides advice to the Commissioner and other appropriate officials on specific complex scientific and technical issues important to FDA and its mission, including emerging issues within the scientific community. Additionally, the Science Board provides advice that supports the Agency in keeping pace with technical and scientific developments, including in regulatory science; and input into the Agency’s research agenda; and on upgrading its scientific and research facilities and training opportunities. It also provides, where requested, expert review of Agency sponsored intramural and extramural scientific research programs.

As Vice President for Research, McLellan is responsible for 

Utah State University’s research administration. USU a Carnegie Research University High Research Activity institution, and Utah's land-grant and space-grant university. The university enrolls over 28,000 students, including 3,900 graduate students, between its main campus in Logan and a vibrant and growing regional campus and distance education (RCDE) system. Utah State ranks in the top ten western universities (non-medical) in research funding and has achieved a second year of over $200M in sponsored program awards. USU's space and aeronautical research funding ranks second in the nation and the university has sent more student experiments into space than any other university in the world. Included in his direct reports are the Office of Sponsored Programs, the Office of Environmental Health and Safety, the Offices of Research Development and Proposal Development, the Office of Research Integrity & Compliance, the Office of Graduate & Undergraduate Research, the Office of Research Computing, the Office of Animal Care & Use, the Institutional Review Board and Technology Transfer Services• In July of 2016, a new Division of Technology Transfer Services was created and moved under RGS as a renewed focus on emerging, new faculty discoveries leading to private licensing opportunities.• McLellan implemented programs to support faculty achieving record levels of university-wide research growth at USU for 3 years in a row (FY14 - FY16) as measured by new faculty awards and accomplished by implementing an integrated set of faculty support/training programs. University research funding for FY2015 was $230 million. In FY2016 we attained $244M in new research awards.• He reviews all university tenure packages as one of only three permanent members of the university central tenure review committee reviewing typically 70 tenure packages per year.

As Dean of the School of Graduate Studies, McLellan oversees the admissions and student completion of graduate studies at Utah State University. With over 3000 graduates in a diverse array of majors spanning research, clinical and professional degrees – quality training is our top priority. To this end the Graduate School conducted an extensive university-wide review of all graduate programs and has instituted an on-going process involving, self-study steps, multi-year planning and self imposed metrics and milestones. • Conducted a univeristy-wide review of all USU graduate programs leading to significant focus on mentoring, management, recruitment and funding.• Created a new USU Presidential Doctoral Research Fellows program funding 10 new four-year fellowships every year until a steady state of 40 are funded in FY2015.• Launched TEDxUSU and positioned USU as one of the newest TED host sites promoting innovative thinking and presentations to move us. • Created a new USU ARTS-STEM Graduate Fellowship pilot program to stimulate unique right brain/left brain thinking in graduates and hybridizing a training experience that crosses arts and sciences/engineers.

A program of Farm Foundation, the Farm Foundation Round Table is an invitational discussion forum comprised of leaders from across the food chain and across North America. The Round Table meets twice yearly to provide a forum for discussion and interaction among members and invited government, academic, agribusiness and other interest group leaders. Programs are designed to explore ideas, analyses and insights that participants may use in their own work. Attendance at Round Table events is limited to members and invited guests.These policy forums provide an opportunity for frank and open dialogue. The exchange of ideas fosters understanding of different approaches to problems which ultimately leads to better public policy. Topics for Round Table meetings are determined by the Round Table Steering Committee. Programs often build on other projects sponsored by Farm Foundation. Round Table discussions also generate new ideas for activities in all Farm Foundation program areas.

The National Agricultural Research, Extension, Education, and Economics Advisory Board (NAREEEAB) provides advice to the Secretary of Agriculture and land-grant colleges and universities on top priorities and policies for food and agricultural research, education, extension and economics. The Board is made up of 25 members, each of which represents a specific category of U.S. agricultural stakeholders, as mandated by Congress. The NAREEEAB's main objective is to contribute to effective federal agricultural research, education and economics programs through broad stakeholder feedback and sound science in its ongoing role as advisor to the Secretary of Agriculture.

•Developed the plan and guided the development of the 2009 UF/IFAS Research Roadmap – a plan for research excellence and return on investment into the next decade and beyond spanning 12 academic departments, 2 schools and 12 Research & Education Centers.•Reviewed and supported typically 30+ tenure packages as lead dean annually and was hiring authority for all new faculty with 50% research appointments greater.•Established the UF/IFAS Invitation to Negotiate Process for Germplasm Licensing – a process that respects the needs of the State of Florida while putting a serious business perspective to licensing of UF/IFAS germplasm and producing significantly increased royalty funds for the plant breeding programs of IFAS, reaching approximately $4 million in 2009.•Created the UF/IFAS Research Innovation Fund for funding faculty research proposals where outside sources are unlikely including [1] high risk research, [2] preliminary data projects needed prior to national funding submission, and [3] near to commercialization projects needed to push developments closer to commercial release. Funded over $1.9 Million in competitive faculty proposals in past three years.•Oversaw the growth of the competitive funding portfolio of UF/IFAS from $68 million to over $91 million in four (4) years, an increase of 33%.•Established new innovative faculty training solutions to support faculty research programs including UF/IFAS Grantsmanship Seminar & Workshop Program.

•Initiated in 2009 – UF/IFAS Legislative Assistant’s Day – briefing congressional legislative assistants on discoveries, innovations and applications developed by IFAS scientists.•Created in 2008 – the first Annual UF/IFAS Research Awards Ceremony recognizing outstanding research performance across all IFAS programs.•Initiated in 2008 – UF/IFAS Research Budget Allocation Taskforce: Proposed Guidelines for Allocating Research Operating Funds. Phased in implementation to start in 2010•Initiated in 2008 – UF/IFAS Publications and Science Metrics for Measuring Quality, Impacts and Outcomes of Research.•Proposed and funded in 2008 the new UF/IFAS Carbon Resources Science Center.•Launched and funded in 2008 the planning process for a new UF Climate Response Institute•Initiated in 2007 - quarterly meetings with the Commissioner of Agriculture and Florida Farm Bureau. Designed to enhance communications and build a significant partnership between Florida Department of Agriculture, Florida Farm Bureau and UF/IFAS. •Proposed & implemented in 2007 a new UF/IFAS policy of a 0% overhead for grower/producer supported research projects.•Established in 2007 - the Plant Science Research & Education Unit Advisory Council – a faculty & stakeholder oversight board to guide operation of our 1000 acre research farm at Citra, FL.•Funded, starting in 2006, $200K into the Howard Hughes Medical Institute Undergraduate Research Program for UF/IFAS undergraduates.•Established, starting in 2006 - the Assistant Professor’s Breakfasts – a monthly breakfast meeting between the Dean for Research and invited IFAS professors for discussion of current issues and concerns.

The NABC provides a forum for issues in agricultural biotechnology from a multi-constituency perspective through its annual meetings, publications, and other outreach efforts.

Chief Executive Officer and member of the board -- Food Update Foundation. The foundation is a non-profit organization of food industry executives, academicians and government officials committed to facilitating constructive discussion on food processing and food policy. The foundation creates a forum for discussions in new trends in food processing and food service, current food science issues, quality assurance, regulation, and global and domestic policies to assure the consumer marketplace is well served

Dr. McLellan was the Director of the Food Protein Research & Development Center of Texas A&M University which was a $2 million annual research and development arm of the Texas Engineering Experiment Station focused on the food and agricultural products areas including oil seeds and their by-products.

Dr. McLellan was Director of the Institute of Food Science and Engineering at Texas A&M University. This Institute had seven centers of expertise and involves over 170 faculty from all across Texas A&M and other Texas Universities, as well as Texas based USDA-ARS researchers. With secured funding in fall of 2003, McLellan was principal investigator for the USDA grant awarded for the National Center for Electron Beam Food Research. McLellan lead the effort to build and create the new Texas A&M University Electron Beam Food Research Facility, a 30,000 sq ft., $10 million research award to create a high capacity research facility in Texas for food scientists in academia, government, and industry. Operating with two 5MeV linear accelerators, the research facility provided core research capacity to many research projects across the university.Dr. McLellan was a Co-PI to the 2005 funded SEAFAST Center project in Indonesia with $5 million startup funding. The Center was established as a regional resource for food entrepreneurs and startup food manufacturing companies supporting the establishment of a food manufacturing environment for Indonesians and the ASEAN region. This grant was the first monetization grant ever awarded to a university by USDA.

Faculty member of Food Science in the department of Biological and Agricultural Engineering.

Chief Executive Officer for 28,000 member NGO scientific non-profit society. Responsible for an annual operating and foundation budget of $14 million. Volunteer staff of 500. Paid staff of 60. Represented the NGO in Washington DC and in United Nations - IAEA and FAO.

Coordinated programs across the food sciences on two major sites. Represented the discipline of Food Science on campus to administration and other units.

Managed the research and outreach programs of Cornell's Food Science & Technology department.

Studied the process technologies of food systems. Was promoted from assistant to associate and on to full professor with tenure.