Find Authors
By Background

Discover books where the author's background brings authenticity and depth.

Selected searches: science-fiction by a physicist military fiction by a military officer cyberpunk by a computer scientist historical fiction by a historian science-fiction by a mathematician crime-fiction by a lawyer popular science by a biologist
Shape Thumb
Shape Thumb
Shape Thumb
Shape Thumb
Shape Thumb
Shape Thumb
poets who wrote autobiography
Showing 225-232 out of 343 results
Robert Morgan
Robert Morgan (born 1944)

biographer, poet

  • University of North Carolina at Chapel Hill, University of North Carolina at Greensboro

View on Open Library
View on Wikipedia

Boone
Our father
Gap Creek
The truest pleasure
This rock
The blue valleys
The hinterlands
Brave enemies
The Mountains Won't Remember Us
My lamp still burns
In Search of Humanity And Deity
Essays
Growing younger
Red owl
Gap Creek
Lions of the West
Some Things Never Die
Gap Creek : The Story of a Marriage
Brave Enemies
The Only Thing to Fear (A Supernatural Mystery)
Terroir
Romans (New Testament Guides,)
Readings in English social history from Contemporary literature ..
The Road From Gap Creek A Novel
The Truest Pleasure
Building an optimizing compiler
Chasing the North Star
Like Chaff to the Wind
Groundwork
Voices in the dark
Gap Creek The Story of A Marriage
Some things come back
Dark energy
This rock
The Things That Are Not There
"Old Gravel Walk"
Gap Creek
The showies
Wild Peavines
Bob-Tales
Lions of the West
World sea fisheries
Zirconia Poems (Booksurge Contemporary Classics)
Fin del Mundo del Arte
The Thing That Darkness Hides (A Supernatural Mystery)
On the banks of the Cynon
Beach user opinions and the development of a beach quality rating scale
The Blue Valleys
Sigodlin
Topsoil Road
Source Readings in Music History
Good Measure: Essays, Interviews, and Notes on Poetry
The anger in Ernest and Ernestine
The Blue Valley
Brave enemies
All Things Under Moon
Das Land des Herzens. Roman
At the edge of the orchard country
The balm of Gilead tree
The storm
The Truest Pleasure
This Rock
The miners and other stories
Bronze Age
The Man Who Flew the Memphis Belle
The showies
The pass
Brave Enemies (Shannon Ravenel Books (Audio))
In the dark
The night's prison: poems, and, Rainbow valley
Wild Peavines
The Strange Attractor: New and Selected Poems
Del Arte a La Idea/ the Art of Idea (Arte Contemporaneo)
Land diving
The Religion of the Incarnation
Teacher's resource book to accompany Magruder's American government, William A. McClenaghan
Green River
For Lofthouse
Land Diving
Zirconia poems
The night's prison, poems & Rainbow Valley, a play for broadcasting
Roberto Coda Zabetta
Gap Creek
As rain turns to snow and other stories
Geest van verlangen
Comme une vallée de larmes
Zirconia poems
Growing Younger : How to Measure and Change Your Body's Age
Trunk & thicket
Bronze age
Philip Levine
Philip Levine (1928-2015)

professor, poet, school teacher, scholar of English, essayist, educator

  • Wayne State University, University of Iowa

View on Open Library
View on Wikipedia

My lost poets
The simple truth
Character and crisis
Poems
What work is
Breath
The mercy
The bread of time
New selected poems
So Ask
Don't ask
The names of the lost
Sweet will
One for the rose
News of the world
Detroit Images
The last shift
1933; poems
Ashes
7 years from somewhere
Pili's wall
News of the world
They feed they lion
Unselected poems
Sweet will
Not this pig
Thistles
First Light
One for the Rose
Red dust
Stranger to nothing
STRANGER TO NOTHING: SELECTED POEMS
Walk/th.jeffersn-Tipd
A walk with Tom Jefferson
Earth, stars, and writers
On the edge
On the edge & over
Ploughshares Vol.14 No.4
5 Detroits
Șerban Savu
Blue
Simple Truths Signed
February 14th
New season
Llanto
Nineteen hundred and thirty-three
Five Detroits
Smoke
Dreaming in Swedish
On the edge
Naming
Dorothy Allison
Dorothy Allison (born 1949)

poet, women's rights activist

  • Florida State University, Eckerd College

View on Open Library
View on Wikipedia

Two or three things I know for sure
Conversations with Dorothy Allison
Trash
Bastard out of Carolina
Skin
Cavedweller
Ida Applebroog
Novel ideas
The women who hate me
The Writer's Notebook
The Road Aces and find Terry! He's lost (Road Aces series)
Zwei oder drei Dinge, die ich sicher weiß
Bastarda
Kuckuckskinder
Heimkehr nach Cayro
Find Terry! He's Lost
Tin House
Peau
A Reader's Guide to the Works of Dorothy Allison
Southern Sin
Dorothy Allison
Best of Tin House
L'Histoire de Bone
Cavedweller B d/Bx18 Inc 3 Free
Deux ou trois choses dont je suis sûre
What it took for me to get here
Bekart z Karoliny
Skin
Walking the edge
Bastard Out of Carolina
Kate Jennings
Kate Jennings (1948-2021)

essayist, poet

View on Open Library
View on Wikipedia

Stanley and Sophie
Moral Hazard
Snake
Save me, Joe Louis
Trouble
The Mole
Women falling down in the street
Mother, I'm rooted
The Missing Heiress
Second Sight
Bad manners
Come to me my melancholy baby
Grant Wood
Hasard des maux
Jaan Kross
Jaan Kross (1920-2007)

translator, pedagogue, professor, poet lawyer, poet, politician

  • University of Tartu

View on Open Library
View on Wikipedia

Omae luloolisus ja alltekst
The conspiracy & other stories
The czar's madman
Professor Martens' departure
The Ropewalker
The Czar's madman
Der Verrückte des Zaren
Kolme katku vahel
Dans l'insaisissable. le roman de juri vilms
Kallid kaasteelised
Das Leben des Balthasar Rüssow
Le Fou Du Tzar
Professor Martens' Abreise
Sailing against the wind
Bibliograafia
Vastutuulelaev
Vahelugemised
The rock from the sky
Tahtamaa
Neli monoloogi Püha Jüri asjus
Söerikastaja
Professor Martens' Departure
Taevakivi
Vihm teeb toredaid asju
Rakvereskiĭ roman ; Ukhod professora Martensa
Imperatorskiĭ bezumet︠s︡
Keisri hull
Teosed
Czar S Madman
Voog ja kolmpii
Kamennye skripki
La Partida del Profesor Martens
Mesmeri ring
Lauljad laevavööridel
Paigallend
Väljakaevamised
Paigalend
Klio silma all
Kogutud teosed
Wikmani poisid
Kivist viiulid
Tabamatus
Na glazakh u Klio
Silmade avamise päev
Professor Martensi ärasõit
Kolmandad mäed
Kamienie Z nieba
Vuelo estático
Book of Falsehoods Between Three Plagues Volume 3
Ķeizara trakais
Uppiniskaisuuden kronikka
Tammsaare
Professor Matensi arasoit
Kross. Üksikud head mehed
Polet na meste
Between Three Plagues
CERCLE DE MESSMER - Roman - Traduit de L'estonien par Jacques Tricot
Day Eyes Were Opened
Rakvere romaan
Vier Monologe Anno Domini 1506
Le départ du professeur Martens
Trzy bicze czarnej smierci, czyli opowiesc o Baltazarze Russowie
Treading Air
Book of Falsehoods
People Without a Past
Claude Adrien Helvétius
Claude Adrien Helvétius (1715-1771)

philosopher, French moralist, poet, encyclopédistes

View on Open Library
View on Wikipedia

Correspondance générale d'Helvétius
A treatise on man
De l'homme, de ses facultés intellectuelles et de son éducation
Oeuvres complètes
Le vrai sens du Systême de la nature: ouvrage posthume de M. Helvétius
Œuvres complettes de M. Helvétius
A treatise on man, his intellectual faculties and his education
Correspondance générale d'Helvétius
De l'homme: de ses facultés intellectuelles, et de son éducation
De l'esprit
Oeuvres complettes de M. Helvétius
De l'esprit
De l'homme, de ses facultés intellectuelles & de son éducation
Notes de la main d'Helvetius
Œuvres complètes
Correspondance générale d'Helvétius
Helvétius
De l'esprit
De L'espirit or Essays on the Mind And Its Several Faculties
Philosophical Works
De l'esprit
Oeuvres complètes
De l'esprit
Treatise On Man
De l'esprit, De l'homme
Bonheur
oeuvres complèttes de Mr. Helvétius: Tome 2
oeuvres complèttes de Mr. Helvétius: Tome 4
Oeuvres d'Helvetius
Politique Naturelle, Ou, Discours Sur les Vrais Principes du Gouvernement; Volume 1
De l'esprit
A Treatise on Man and His Education
De l'esprit
Oeuvres complètes de m. Helvétius
De l'esprit
De l'homme, de ses facultes intellectuelles et de son education . 1
uvres complèttes de Mr. Helvétius: Tome 1
Notes de la main d'Helvetius
Oeuvres completes
Oeuvres completes
Treatise on Man, His Intellectual Faculties and His Education; Volume 1
Le vrai sens du Systême de la nature
The Golden Calf
Œuvres complèttes
De l'esprit, or, Essays on the Mind, and Its Several Faculties
De l'esprit
Correspondance Générale d'Helvétius, Volume IV
Oeuvres completes
Bonheur, Poéme, en Six Chants. Avec des Fragments de Quelques épîtres. Ouvrages Posthumes de M. Helvétius
De L'Esprit
A Treatise on Man, His Intellectual Faculties and His Education
De l'esprit des Lois, Sixième Édition
De l'homme, de ses facultés intellectuelles & de son education. Ouvrage posthume de M. Helvetius. ... of 2; Volume 1
De l'homme
De L'esprit
A Treatise on man, his Intellectual Faculties and his Education. A Posthumous Work of M. Helvetius. Translated From the French, With Additional Notes, by W. Hooper, ... of 2; Volume 2
De l'esprit, or, Essays on the mind and its several faculties
Vom Menschen, seinen geistigen Fähigkeiten und seiner Erziehung
De l'homme, de ses facultés intellectuelles et de son éducation. Ouvrage posthume de M. Helvetius. ... of 2; Volume 2
Les progrès de la raison dans la recherche du vrai
Oeuvres Completes de M. Helvétius. of 4; Volume 1
Les progrès de la raison
Correspondance Generale D'Helvetius
Correspondance Générale D'Helvétius
De l'homme, de ses facultés intellectuelles et de son education
OEuvres Completes de M. Helvétius. of 4; Volume 4
De l'homme, Volume 2...
De l'esprit, De l'homme, notes, maximes et pensées, Le bonheur, lettres, appendice: documents, anecdotes, bibliographie
Oeuvres complètes Tome 11
De l'homme, de Ses Facultés Intellectuelles et de Son Éducation, Volume 3...
Le Bonheur, poëme en 6 chants, avec des fragmens de quelques épîtres
Oeuvres Complettes D'helvetius
De L'esprit
The true meaning of the System of nature
Correspondance Générale d'Helvétius, Volume III
Herrn Johann Claudius Hadrian Helvetius hinterlassenes werk Vom Menschen
De l'homme
Oeuvres Complètes D'helvétius
Correspondance Générale d'Helvétius, Volume I
Correspondance Generale
Lettres de M. Helvétius au président de Montesquieu, et à M. Saurin, relatives à l'aristocratie de la noblesse
A treatise on man; his intellectual faculties and his education
Correspondance Générale d'Helvétius, Volume V
De l'homme, de ses facultés intellectuelles, et de son éducation. Ouvrage posthume de M. Helvetius. ... of 2; Volume 1
El verdadero sentido del sistema de la naturaleza
Correspondance Générale d'Helvétius, Volume II
A catechism
The child of nature
Œuvres d'Helvetius .
Oeuvres Complettes de M. Helvétius. Nouvelle Edition, Corrigée & Augmentée Sur Les Manuscrits de l'Auteur, Avec Sa Vie & Son Portrait. ... of 2; Volume 2
Œuvres complètes
De l'esprit
Oeuvres complettes d'Helvetius
Oeuvres complettes de M. Helvétius
Pro li͡udynu, ïï rozumovi zdibnosti ta ïï vykhovanni͡a
Oeuvres complettes de M. Helvetius
Le bonheur
Discurs über den Geist des Menschen ...
Oeuvres compláetes d'Helvetius
A treatise on man, his intelectual faculties and his education
Oeuvres completes
uvres complettes d'Helvetius
De l'homme
Notes de la main d'Helvétius
A ventura
Poésies de M. Helvetius
Oeuvres completes
Oeuvres completes
Oeuvres completes
De l'esprit tome premier-[second]
Oeuvres completes
A ventura
Oeuvres completes de M. Helvétius ; tome premier-[quatrieme]
Œuvres complettes de M. Helvétius
Le bonheur, poeme en six chants
Les principes d'intérêt personnel et d'utilité publique
Le bonheur, poéme, en six chants
Oeuvres complettes d'Helvétius
Oeuvres completes de M. Helvétius
Oeuvres completes
Oeuvres complettes de M. Helvetius
Johann Claudius Hadrian Helvetius hinterlasseness Werk vom Menschen
Poésies
Œuvres completes
Réflexions sur l'homme & autres textes
Oeuvres completes
[Oeuvres philosophiques de M. Helvétius
Oeuvres completes
Œuvres complètes de M. Helvétius
Oeuvres completes
Œuvres complètes d'Helvétius
Le bonheur
De l'homme
Oeuvres d'Helvetius ..
Oeuvres completes de M. Hélvetius
Oeuvres completes
Oeuvres complètes d'Helvétius ...
Oeuvres completes
Sochinenii︠a︡
De l'homme, de ses facultés intellectuelles, et de son éducation
De l'esprit, or Essays on the mind and its several faculties
Vassilis Vassilikos
Vassilis Vassilikos (1933-2023)

poet, journalist, diplomat, politician

  • Aristotle University of Thessaloniki, Anatolia College

View on Open Library
View on Wikipedia

Mnēmē apo melani
Outside the walls
The photographs
Zēta
The few things I know about Glafkos Thrassakis
The Monarch
--And dreams are dreams
Z
The monarch
Z
The plant, the well, the angel
O komitis tou Halley, iparhoun oneira
The few things I know about Glafkos Thrassakis
To teleftaio antio
I zoi mou oli
Tesseris prosanatolismenes polis
Kath Odon
O Komitis tou haley
The harpoon gun
I trilogia
I Trilogia
Group-Ellas
Hē mnēmē epistrephei me lastichenia pedila
To strato
The coroner's assistant
O iatrodikastis
Lounik II
To psarotoupheko
Laka-Souli
20:20'
To Gramma tēs agapēs
Kroup-Ellas
25 etia
To limani tēs agōnias (kai alla diēgēmata)
E kathodos
Oi phōtographies
To helikoptero
"Hē zoē mou holē"
Hē dikē tōn ex
To portraito enos agōnistē
Imantes
Tesseris prosanatolismenes poleis
O iatrodikastēs
To paravan
"Hē zōē mon holē"
Hē zōē mou holē
To kalokairi tou Erōtokritou
Ta silō
Kapheneion "Eminkrek"
To magnētophōno
To psarotoupheko
Anamnēseis apo ton Cheirōna
Ho asvos, hē, Hoi peripeteies mias dyskolēs anarrōsēs
O thanatos tou Amerikanou
Bella ciao
To sphrato
Ho monarchēs
Lounik II
Ē kathodos tou Makedona
Hē vathia hellēnikē krisē
Anepidotē epistolē ston Alexandro Panagoulē
Ho Chordistēs
Ta chaza boutia
Ho tromeros mēnas Augoustos (13.8.78-30.9.78)
To Teleutaio Antio
Portraita
Glaukos Thrasakēs, mythistorēma
Hē asprē arkouda
Ē mythologia tēs Amerikēs
Kroup-Hellas
Chrono graphēmata
To magnētophōno dyo
Ho Eurōpeos kai hē hōraia tou hyperperan
Ho iatrodikastēs
Trochalies
To elikoptero
Thymata eirēnēs
Autoktonia me ero te matiko
E zo e mou ole
To phyllo ; To pēgadi ; T' angeliasma
Ektos tōn teichōn
Anamnēseis apo ton cheirōna, kai alles istories
To teleutaio antio
Ho planodios plasie
Ta "Kamakia"
Ho anthrōpos me to adeio
Ē asprē arkouda
Hē kathodos
20:20 ́
Anamnēseis apo ton Cheirōna, kai alles histories
Trilogie
Hē m ythologia tēs Amerikēs
Le journal de Z
Oi lōtophagoi
Hēlie mou, Artaxerxē mou
Pascha stous Gargalianous
To vrachioli
Peri logotechnias kai allōn daimōniōn
Hoi rempetes, kai alla diēgēmata
Thymata eirēnēs
Portraita
To magnētophōno dyo
Ē phloga tēs agapēs (foco d'amor)
Phiphty-phiphty
To teleutaio antio
Kapheneion "Eminkrek"
Himantes
O tromeros mēnas Augoustos (13.8.78-30.9.78)
Hena-hena-tessara metōkēsen eis agnōston dieuthynsin
Hoi phōtographies
To "nero", to "helion" tēs Kō
Hors les murs
Mathēma anatomias, 1965-1978
Metōkēsen eis agnōston dieuthynsin
K
To phyllo
To lacheio
Ē dikē tōn ex ..
Stelios Kazantzidēs 1931-2001
Aisthēmatōn nomismata
Ta silo
Anepidote epistole ston Alexandro Panagoule
Ho Apostolos Paulos stē philakē tōn Philippōn
Metōkēsen eis agnōston dieuthynsin
To kalokairi tou erōtokritou
Hē diēgēsē tou Iasona
To phyllo
He doloktonia
Phiphty-phiphty
Hoi " Prosōkratikoi"
Ta apokrypha tou Glaukou Thrasakē
Se gnōrizō apo tēn kopsē--
290 prosōpa
O monarchēs
Aftokonia me erotimatiko
Ho thanatos tou Amerikanou
Mia historia agapēs
To "Nero" (to "helion" te s Ko )
To phyllo
Hoi lōtophagoi
To magnētophōno
Ē " doloktonia"
Autoktonia me erōtēmatiko
Ē diēgēsē tou Iasona
Yparchoun oneira
Glaukos Thrasakēs
Pascha stous Gargalianous
Dyo syngrapheis, mia dekaetia
To limani tēs agōnias
O apostolos Paulos stē phylakē tōn Philippōn
O planodios plasie
To limani tes agonias (Kai alla dingnmata)
[Zēta]
Ektos tōn teichōn
To prōto kai teleutaio poiēma tou L.K. Ligo prin autoktonēsei sta dekaennia tou chronia
Diva
Tesseris prosanatolismenes poleis
To hēmerologio tou "Z"
Enklēma stēn Kopenchagē
Se gnōrizō apo tēn kopsē ...
Parisi - korydallos
Ta poiēmata (1948-1949)
Erga Vasilē Vasilikou
To " nero"
Z
O chordistēs
Hē ateleiōtē epistolē
Ē ateleiōtē epistolē
To Lacheio
20.20' [i.e. Eikosi.eikosi] kai Phiphty phiphty
Laka-Souli
Neanikē allēlographia, 1954-1960
Magia
Thymata eirēnēs
Hē apologia tou Z
Poste restante
Ho monarchēs
Hoi ōraioi oreoi
To psarotoupheko ; Hē "doloktonia"
Un po©·te est mort
Hēmerologio Thasou
Hoi phōtographies
Onar hēmerophanton
Les photographies
Les soleils couchants
Hē diēgēsē tou Iasona
Alfatride
Mnēmē apo melani
Ho monarchēs
Dyo syngrapheis, mia dekaetia
Lyra Hellēnikē
Hē mythologia tēs Amerikēs
Ta silo
To phyllo, to pēgadi, t'angeliasma
D̲iva
Le Monarque ...
Esy ki egō
Ta poiēmata
Hoi rempetes
En ptēsei
Hoi gates tēs Rue d'Hauteville
Lunik II
L'hélicoptère
Z
To psarotoupheko ; Hē "doloktonia"
8 1/2
Mikhail Lomonosov
Mikhail Lomonosov (1711-1765)

astronomer, geologist, physicist, chemist, linguist, poet, historian, philosopher, inventor, mosaicist, geographer, mathematician, politician, painter, scientist, translator

  • Slavic Greek Latin Academy, Kyiv-Mohyla Academy

View on Open Library
View on Wikipedia

Perepiska
Lomonossov, 1711-1765, sa vie, son oeuvre
Sochineniia
Lomonossov, 1711-1765, sa vie, son oeuvre
Physikalisch-chemische abhandlungen M. W. Lomonossows, 1741-1752
Drevni͡ai͡a rossiĭskai͡a istorii͡a ot nachala rossiĭskogo naroda do konchiny velikogo kni͡azi͡a I͡Aroslava Pervogo, ili do 1054 goda
Mikhail Vasilʹevich Lomonosov. Iz nasledii︠a︡ Lomonosova. Slovo sovremennikov o Lomonosove. Pami︠a︡tʹ vechna
Alte russische Geschichte von dem Ursprunge der russischen Nation
Sochinenie Lomonosova
Sochineniia
Polnoe sobranie sochinenii Mikhaila Vasilevicha Lomonosova
Izbrannye filosofskie sochinenii͡a︡
Mikhail Vasilʹevich Lomonosov on the corpuscular theory
Pisḿa ; Perevody ; Stikhotvorenii͡a︡ ; Ukazateli
Poltavskai͡a︡ batalii͡a︡
Pervye osnovanii︠a︡ gornoĭ nauki
Izbrannye proizvedenii͡a︡
Izbrannye trudy po khimii i fizike
Ausgewählte Schriften
Izbrannye filosofskie proizvedenii͡a︡
Rossiǐskaia grammatika
O vospitanii i obrazovanii
Zapiski po russkoĭ istorii
Izbrannye sochinenii͡a
Sochinenīi︠a︡
Meditationes de solido et fluido solemnibus sacris Augustissimi nominis serenissimae potentissimae magnae dominae imperatricis Elisabetae Petri Magni filiae autocratoris omnium Rossiarum praelectae in Academiae Scientiarum Petropolitanae conventu publico, die VI. sept. a. MDCCLX
On the strata of the Earth
Polnoe sobranīe sochinenīĭ Mikhaĭla Vasilʹevicha Lomonosova
Estestvennye nauki i filosofii͡a︡
A chronological abridgement of the Russian history
Izbrannyi︠a︡ sochinenīi︠a︡
Izbrannai︠a︡ proza
Sochinenīi︠a︡ M.V. Lomonosova v stikhakh
Polnoe sobranie sochineniĭ
Elemens de la langue russe, ou, Methode courte et facile pour apprendre cette langue conformement a l'usage
Izbrannye proizvedenii︠a︡
Slovo o proiskhozhdenīi svi︠e︡ta
Russische Grammatick
Sochinenii͡a︡
Poems
Oratio de origine lucis
Rossīĭskai︠a︡ grammatika
Sochinenii︠a︡ v stikhakh
Obozrenie rukopiseĭ lomonosova i materialov o nem, khrani︠a︡shchikhsi︠a︡ v moskovskikh i leningradskikh arkhivakh, muzeĭakh i bibliotekakh
Sochinenii͡a v stikhakh
Sochinenīi︠a︡ Lomonosova
Polnoe sobranie sochineniĭ
Sobranīe sochinenīĭ Mikhaila Vasilʹevicha Lomonosova
Pokoĭnago statskago sovetnika i professora Mikhaily Vasilʹevicha Lomonosova sobranīe raznykh sochinenīĭ v stikakh i v prozi︠e︡
Sochinenīi︠a︡
Izbrannyi͡a sochinenīi͡a
Pervyĭ russkiĭ akademik
Sobranīe raznykh sochinenīĭ v stikhakh i v prozi︠e︡ Mikhaĭly Vasilévicha Lomonosova
Rossiĭskai︠a︡ grammatika
Dukhovno-nravstvennyi︠a︡ pi︠e︡snopi︠e︡ni︠a︡ Lomonosova, Derzhavina i Karamzina
Drevni︠a︡i︠a︡ rossiĭskai︠a︡ istorii︠a︡ ot nachala rossiĭskago naroda do konchiny velikago kni︠a︡zi︠a︡ I︠A︡roslava Pervago ili do 1054 goda
A chronological abridgment of the Russian history
Na doroge v Petergof
Sochinenīi︠a︡ Lomonosova
Istorii͡a︡, filologii͡a︡, poėzii͡a︡
L'apothéose de Pierre le Grand, etc
Sochinenii︠a︡
Sistema "Planeta Zemli︠a︡"
Rassuzhdenīe o bolʹsheĭ tochnosti morskago puti
Kratkoĭ rossīĭskoĭ li︠e︡topiset︠s︡ s rodoslovīem