Simple categories matching knowledgeable:

• observer,
• scientist,
• person,
• professional,
• journalist,
• leader,
• expert,
• geek,
• presenter,
• academician,
• authority,
• reporter,
• person,
• nerd,
• physician,
• practitioner,
• party,
• individual,
• philosopher,
• communicator,
• people,
• adult,

Members with property knowledgeable:

• Jeff_"Comic_Book_Guy"_Albertson,
• historian,
• community_consultant,
• Jeremy_Paxman,
• market_trader,
• tom,
• community_worker,
• Lisa_Simpson,
• Leonard_Hofstadter,
• Peter_Parker,
• elder,
• annuitant,
• recreation_director,
• consultant,
• industrial_practitioner,
• nerd,
• boss,
• lawyer,
• peer_counselor,
• brother,
• Wesley_Crusher,
• conference_moderator,
• coastguard,
• financial_manager,
• job_coach,
• builder,
• curriculum_designer,
• Sheldon_Cooper,
• mps,
• banker,
• tutor,
• environmentalist,
• Lois_Lane,
• former_combatant,
• officer,
• health_educator,
• field_expert,
• land_manager,
• sixth_defense,
• counsellor,
• naturalist,
• shop_owner,
• mi,
• regulator,
• teacher,
• developer,
• wildlife_biologist,
• extension_officer,
• government_surveyor,
• manager,
• psychoanalyst,
• Bill_O'Reilly,
• shopkeeper,
• attorney,
• realtor,
• physician,
• scholar,
• school,
• faculty,
• doctor,
• seasoned_amateur,
• trainer,
• endocrinologist,
• dance_teacher,
• educational_manager,
• alcohol_counselor,
• youth,
• native_doctor,
• lab_manager,
• postal_employee,
• web_designer,
• lead_engineer,
• traditional_healer,
• mark,
• immunologist,
• geologist,
• imam_malik,
• geek,
• school_administrator,
• building_superintendent,
• dermatologist,
• ceo,
• town_treasurer,
• woman_leaders,
• owner,
• baronial_herald,
• soil_scientist,
• toxicologist,
• landlord,
• dietician,
• sales_person,
• wildlife_scout,
• medical_professional,
• proprietor,
• interviewer,
• counselor,
• professional,
• academician,
• midwife,
• farrier,
• provider,
• state,
• vendor,
• pharmacist,
• juvenile_court,
• reporter,
• building,
• religious_leaders,
• genetic_counselor,
• rheumatologist,
• agronomist,
• support_technician,
• lactation_consultant,
• politician,
• scientist,
• chaplain,
• academic_analyst,
• peer_teacher,
• forester,
• journalist,
• epa_personnel,
• physical_therapist,
• forest_pathologist,
• branch_representative,
• parent,
• water_police,
• legal_guardian,
• national_authorities,
• clinician,
• coach,
• professional_trainer,
• educational_diagnostician,
• herald,
• engineer,
• practitioner,
• case,
• community_allergist,
• respiratory_therapist,
• community_leaders,
• marketing_director,
• good_teacher,
• cooperative,
• city_engineer,
• plant_breeder,
• supervisor,
• breeder,
• professor,
• nurse,
• family_member,
• caregiver,
• herbalist,
• beneficiary,
• relief_personnel,
• financial_expert,
• expert,
• local_leaders,
• healthcare_provider,
• researcher,
• key_school,
• colleague,
• presenter,
• blue-goose_alliance,
• pastor,
• surgeon,
• mentor,
• prof,
• reporter,
• postal_carrier,
• peer,
• branch,
• allergist,
• authorised_person,
• operator,
• veterinarian,
• neighbor,
• social_worker,
• journalist,
• Megyn_Kelly,
• user,