Managing Partner & Principal Consultant
Established in 2017, PetersonMangum, LLC helps organizations increase their effectiveness and navigate critical junctures through strategic consulting and leadership support. Our practice seeks to identify and cultivate internal and external relationships so that organizations can leverage the power of deep collaboration. PetersonMangum draws upon a combined 21 years of experience to unlock increased impact through strategic planning, organizational capacity building, stakeholder cultivation, board development, and fundraising.
Clementine Montessori School | strategic planning retreat facilitation, comprehensive board development (retreat, audit, and training), and full three-year strategic plan design
Mantua Civic Association | multi-session strategic board retreat facilitation and major funder grant report preparation
PHILADANCO! | board and organizational model consultation, fundraising recommendations, and strategic advising
Lil' Filmmakers | business and program model evaluation, strategic planning consultancy, and leadership coaching
Compass Rose Spatial Design | business and program model evaluation and leadership coaching
Education Plus Health | grantwriting and document review/editing
Cicely Peterson-Mangum, Esq., Managing Partner &
Cicely is a strategic leader who has worked in both non-profit and for-profit sectors including education, economic development, government, and law. Cicely most recently served as Executive Director of Drexel University’s Dornsife Center for Neighborhood Partnerships, where she functioned as a primary liaison between Drexel’s academic programs, community partners, and philanthropists, and advanced community-inspired and data-driven initiatives. Cicely led the Dornsife Center’s strategic planning process, developing a collective vision and strategic programming priorities for the organization.
Prior to joining Drexel University, Cicely served as Interim Chief Executive Officer of Imhotep Institute Charter High School, where she successfully led the school’s charter renewal efforts. Similarly, in her role as Executive Director of Logan Community Development Corporation, she revived a defunct clearinghouse for relocation payments to victims of Logan sinking homes into an organization with a refreshed vision and mission to implement transformative community development. Cicely also directed commercial corridor revitalization efforts at Mt. Airy USA, where she was appointed the first Executive Director of the Mt. Airy Business Improvement District.
As a practicing attorney, Cicely was a tax litigator at Linebarger Goggan Blair & Sampson, LLP, representing clients in the municipal and financial services sectors. She is a sought-after speaker and expert in neighborhood development, education innovation, economic development, and leadership. The recipient of several awards for community leadership, she was listed among the Philadelphia Tribune’s "10 People Under 40 to Watch" and the Philadelphia Business Journal’s “40 Under 40.”
Cicely holds a J.D. from Western New England University School of Law and a B.A. from the University of Virginia. She earned a certificate in Nonprofit Management from La Salle University and is a graduate of the Nonprofit Executive Leadership Institute (NELI) of Bryn Mawr College Graduate School of Social Work and Social Research. Cicely is a member of the inaugural class of the Philadelphia African-American Leadership Development Forum. She serves on the board of trustees of the Seybert Foundation and the University of Virginia's IDEA Fund (inclusion, diversity, equity, and access), and previously was on the board of the Philadelphia Association of Community Development Corporations.
Derren A. Mangum, Partner & Consultant
Derren brings together decades of professional writing with over nine years of non-profit fundraising experience to assist organizations with the synthesis of compelling communication across many aspects of their operations. He specializes in a thoughtful process of investigation and iteration to help craft persuasive materials through robust, concise content. Derren is currently Director of Institutional Giving for Opera Philadelphia, where he provides leadership for the organization's foundation, corporate, and government campaigns, which account for approximately $4 million annually. Prior to his work at Opera Philadelphia, Derren worked in online and corporate communications, real estate settlement, and web design, always maintaining a core focus on written communications both professionally and personally.
Derren holds a B.A. in Rhetoric and Communications Studies from the University of Virginia and earned a Certificate in Editing from Temple University Center City. He is a member of the Education Nominating Panel, which was tasked to provide candidates to the mayor for the Philadelphia's new Board of Education. Derren has just completed over five years of board service for the C.W. Henry School PTA, most recently as president.
7715 Crittenden St, #165
Philadelphia, PA 19118